Testoval Copper Test Kit – manual analysis of copper content The evaluation of the Testoval Copper test kit from Heyl is carried out visually via the color scale, allowing a direct concentration comparison. The test kit includes all necessary components required for the analysis. The Testoval Copper test kit is a colorimetric color comparison test kit for the fast manual analysis of copper (Cu) in water samples. A distinct color change is produced through a chemical reaction of the reagents, which can then be reliably read using the included color comparator. Advantages of the Copper Test Kit from Heyl at a glance The complete test kit with reagents and color comparator provides fast, visual, and precise measurement results when determining hydrazine content. Without the need for an electronic measuring device, the test kit is compact and portable, making it ideal for regular inspections and service applications. Possible application areas of the Testoval Copper Test Kit Thanks to its compact design, the test kit is ideal for mobile use as well as for routine checks directly on-site or in the laboratory. The test kit can be used in water treatment, in technical systems, or for regular quality control. Technical Data Measuring range: 0–3 mg/l Cu Readable values: 0, 0.1, 0.2, 0.5, 1, 2, 3 mg/l Number of analyses: approx. 100 Measurement time: approx. 2 minutes Refill option without purchasing a new test kit With the Testoval Copper reagents refill pack, the reagents can be replaced without purchasing the complete test kit again – an economical and sustainable solution for repeated measurements. Item number 410563 Refill pack Testoval Copper Reagents Item number 410564 Replacement Color Comparator

Testoval Hydrazine Test Kit – manual analysis of hydrazine content Testoval Hydrazine color comparison test kit for fast manual analysis of hydrazine content in water in the concentration range of 0–1 mg/l N2H4. The scope of delivery includes reagents as well as a color comparator for simple concentration determination. The Testoval Hydrazine test kit is used for the fast manual determination of hydrazine (N₂H₄) in water samples. The analysis is carried out via a chemical reaction with reagents that produce a visible color change. The hydrazine concentration can then be reliably determined through optical comparison in the comparator. In addition to the reagents, the scope of delivery also includes a color comparator for concentration determination, a measuring tube, and a measuring spoon. Advantages of the Hydrazine Test Kit from Heyl The complete test kit with reagents and color comparator is ideal for mobile use thanks to its compact design. Hydrazine can be determined quickly and easily via optical color comparison. No electronic measuring device is required. Possible application areas of the test kit The hydrazine test kit can be used in various fields. It is primarily used for determining hydrazine in water samples but can also be used for simple gold analyses due to the chemical reaction. Technical data of the Testoval Hydrazine Test Kit from Heyl Number of analyses: approx. 100 Measurement time: approx. 2 minutes Measuring range: 0–1 mg/l N₂H₄ Readable values: 0 mg/l, 0.05 mg/l, 0.1 mg/l, 0.25 mg/l, 0.5 mg/l and 1 mg/l Order the Testoval Hydrazine Reagents Refill Pack conveniently online As an alternative to the complete test kit, you can also order the Testoval Hydrazine reagents refill pack. This saves costs, as you do not need to purchase the entire test kit again. The refill pack contains 2 bottles of reagents with 52 ml each. Item number: 410557 Testoval Hydrazine Reagents Refill Pack Item number: 410558 Replacement Color Comparator TESTOVAL Hydrazine

Testoval Iron 0-1 mg/L Test Kit ||/||| - Precise Iron Analysis Rapid iron determination with clear color reaction The Testoval Iron 0-1 mg/L color comparison kit is used to determine the iron content in water within a concentration range of 0-1 mg/L Fe. Individual values of 0.05 mg/L, 0.1 mg/L, 0.25 mg/L, 0.5 mg/L, 0.75 mg/L, and 1 mg/L can be read using an optical color comparison. The kit includes two reagents and a color comparison device for simple concentration determination. The color comparison kit enables reliable detection of low iron concentrations in water. By diluting the water sample at a 1:10 ratio with distilled water, the measurement range can be extended up to ten times. Fast and reliable determination of low iron concentrations in water The test kit is ideal for applications where low iron levels need to be reliably monitored, such as drinking water monitoring, water treatment, or technical installations. Advantages of the Testoval Iron 0-1 mg/L Test Kit The color comparison kit allows for a simple and rapid manual analysis of iron content with a clearly visible color reaction. The included color comparison device supports accurate evaluation and reduces user errors. By diluting the water sample at a 1:10 ratio with distilled water, the measurement range can be flexibly extended up to 10 mg/L Fe. This makes the test kit highly versatile and suitable for both routine checks and extended analyses. Frequently asked questions How long do Heyl chemicals last? The shelf life is printed on the label of each product. Upon delivery, the guaranteed shelf life is at least 7 months. Can Heyl reagents also be purchased individually? That depends on the specific item to be ordered. For Testoval products, only the complete refill pack can be ordered. The individual small bottles cannot be reordered separately. For the Duroval test kit, the individual components of the refill pack can also be reordered separately. Can the indicator and titration solution be purchased separately? Yes, this is possible for the Duroval product range. Where can I find the safety data sheet? The safety data sheet can be found directly with the product in our shop or separately in the download area under the relevant heading. How can the chemicals be disposed of? Disposal instructions can be found in section 13 of the safety data sheet. Disposal must be carried out in accordance with official regulations. Can the chemicals still be used after the expiry date? No, the chemicals can no longer be used after the expiry date. After the expiry date, accurate measurement results can no longer be guaranteed. How should Heyl chemicals be stored? Section 7 of the safety data sheet contains all relevant information on the storage of chemicals. The recommended storage temperature should be between 15-25°C.

Testoval Iron 0–10 mg/l II/III Test Kit – Efficient Iron Analysis Measurement of iron concentration with the Heyl Testoval Iron kit The Testoval Iron 0–10 mg/l II/III Test Kit is used to determine higher iron concentrations in water. Individual values of 0.25 mg/l, 0.5 mg/l, 1 mg/l, 2.5 mg/l, 5 mg/l, and 10 mg/l can be read using an optical color comparison. The kit allows reliable and rapid determination of iron concentration up to 10 mg/l. In addition to the three reagents, a color comparison device for easy concentration determination is included. Approximately 60 analyses can be performed, with a measurement time of about 7 minutes each. Reliable Determination of Higher Iron Concentrations in Water The Testoval Iron 0–10 mg/l II/III Test Kit enables precise measurement of iron concentrations in water samples over an extended range. Using optical color comparison, individual values of 0.25 mg/l, 0.5 mg/l, 1 mg/l, 2.5 mg/l, 5 mg/l, and 10 mg/l can be read accurately. The kit is especially suitable for applications where elevated iron levels need to be monitored, e.g., in drinking water treatment, industry, or process and operational water analysis. Advantages of the Testoval Iron Test Kit for Water Analysis The Testoval Iron Test Kit allows fast and reliable iron determination with a measurement time of approximately 7 minutes per analysis. The included color comparison device simplifies evaluation and ensures reproducible results. With the three reagents provided, around 60 analyses can be performed, making the kit an economical solution for routine checks. It helps users detect iron contamination early and take appropriate measures to maintain water quality. Frequently asked questions How long do Heyl chemicals last? The shelf life is printed on the label of each product. Upon delivery, the guaranteed shelf life is at least 7 months. Can Heyl reagents also be purchased individually? That depends on the specific item to be ordered. For Testoval products, only the complete refill pack can be ordered. The individual small bottles cannot be reordered separately. For the Duroval test kit, the individual components of the refill pack can also be reordered separately. Can the indicator and titration solution be purchased separately? Yes, this is possible for the Duroval product range. Where can I find the safety data sheet? The safety data sheet can be found directly with the product in our shop or separately in the download area under the relevant heading. How can the chemicals be disposed of? Disposal instructions can be found in section 13 of the safety data sheet. Disposal must be carried out in accordance with official regulations. Can the chemicals still be used after the expiry date? No, the chemicals can no longer be used after the expiry date. After the expiry date, accurate measurement results can no longer be guaranteed. How should Heyl chemicals be stored? Section 7 of the safety data sheet contains all relevant information on the storage of chemicals. The recommended storage temperature should be between 15-25°C.

Colour comparison kit for rapid manual analysis of aluminium content in water within a concentration range of 0–2.0 mg/l Al. The Testoval Aluminium Test Kit is a colour comparison kit for the manual analysis of aluminium content in water within a range of 0 to 2.0 mg/l aluminium. The kit allows the aluminium concentration to be read directly using a colour scale. Simple aluminium testing in water A slight colour change in the colour comparison device reveals the aluminium content. A water sample is placed in the supplied device, the reagents are added, and the colour intensity is then compared with a scale to read the value. Values from 0 to 2.0 mg/l can be read. By diluting the sample with distilled water in a ratio of 1:10, the measuring range can be extended to 10 times the concentration if required. When diluted with distilled water in a ratio of 1:10, the range is 0–20 mg/l (hand test) and 0–10 mg/l (PPM 150). Advantages and areas of application The test kit: Enables rapid manual determination of the aluminium content in water Works without electricity or a photometer; requires only colour comparison and reagents Provides results in approx. 6 minutes and is sufficient for approx. 130 analyses A wider measurement range can be covered by diluting the sample Such colour comparison tests are well suited for rapid checks in water treatment, swimming pools, industrial facilities or environmental measurements.

Colour comparison kit for the rapid manual analysis of the ammonium content in water within a concentration range of 0 to 10 mg/l NH4+. The Testoval Ammonium Test Kit is a colour comparison kit that allows the ammonium content in water to be determined visually by comparing colours. This enables you to quickly determine how much ammonium is present in the water without the need for electronic measuring devices. How does the Ammonium Test Kit work? The test kit operates on the colour comparison principle. A defined amount of water is placed in a measuring tube, and the appropriate reagents are added. You then pour this mixture into a cuvette. Insert the cuvette into the ammonium colour comparison device. After a measurement time of approximately four minutes, a colour develops which is compared with the scale on the device. The more intense the colour, the higher the ammonium content. Individual values of 0.1 mg/l, 0.5 mg/l, 1 mg/l, 2.5 mg/l, 5 mg/l and 10 mg/l can be read directly from the visual colour comparison. Why is the test kit practical? The Testoval Ammonium Test Kit makes checking the ammonium content in water quick and easy. Everything needed for testing is included in the kit. The measurements provide reliable results within a few minutes and are suitable for regular quick checks in swimming pools, wells or water treatment plants. The kit allows you to carry out approximately 70 analyses.

Testoval Chloride Test Kit – Manual Analysis of Chloride Content Color comparison test kit from Heyl for fast manual analysis of the chloride content in water in the concentration range of 0–100 mg/l Cl. The Testoval Chloride Test Kit is a color comparison analysis device for the fast manual determination of chloride content in water. The measurement is carried out by a chemical reaction with reagents that produces a color change. The sample is then compared with a scale in the color comparison device, allowing the chloride value to be read easily. In addition to the two reagents, the scope of delivery includes a color comparison device for simple concentration determination. Technical Data for the Chloride Test Kit from Heyl The individual values 1 mg/l, 5 mg/l, 10 mg/l, 25 mg/l, 50 mg/l and 100 mg/l can be read by optical color comparison. Number of possible analyses: approx. 40 Measurement time: approx. 3 minutes Advantages of the Color Comparison Test Kit from Heyl no electronic measuring devices required suitable for routine checks of water samples provides clear and easy-to-read results complete test set with reagents and color comparison device Possible Application Areas of the Testoval Chloride Test Kit laboratory analyses and quality controls water treatment plants drinking water monitoring environmental and water analysis Also Available in Our Shop: Item number: 410527 Testoval Chloride Reagents Refill Pack Item number: 410528 Chloride color comparison device Testoval

With the Testoval Chlorine DPD from Heyl, it is possible to obtain visual measurement results within a few minutes. The kit is perfectly suited for water samples in the range of 0.1 to 1 mg/l. Both low-dosed and slightly higher chlorine values within this range can be determined directly. Testoval Chlorine DPD 0.1 - 1 mg/l Test Kit – suitable for fast chlorine measurement The Testoval Chlorine DPD 0.1 1 mg/l test kit is a color comparison analysis set that allows you to visually determine the content of free and total chlorine in water. It covers a measuring range from 0.1 mg/l to 1 mg/l and is suitable for fast, manual water analyses. With this test kit, the amount of chlorine in the water is determined through an optical color comparison. Accordingly, this test kit is ideal for detecting chlorine concentration within a few minutes. Technical details and contents of the test kit Complete color comparison kit Color comparator Reagents A, B and C Measuring spoon Measuring tube Cuvette Approx. 70 measurements possible with the included reagents Measurement time – approx. 1 minute per analysis Why buy the Testoval Chlorine DPD from Heyl? Intuitive measurement via color comparison instead of a digital device Fast results in only ~1 minute Ideal for free and total chlorine in drinking and process water Compact equipment for mobile and fast measurement Possible applications Environment, industry and maintenance Disinfection systems Control of disinfection and cleaning processes Testing chlorine levels in drinking water or process water Refill packs: 1 set of reagents for approx. 70 analyses: Order no. 410521 Replacement color comparator: Order no. 410522

The Testoval Chlor DPD 0.5-4 mg/l is a handy colour comparison test kit for quickly determining the free and total chlorine content in water in the range from 0.5 to 4 mg/l. Within about one minute, you can see how much chlorine is contained in the water. Quickly determine chlorine levels – easily and reliably The test works according to the DPD method. This means that you place a defined amount of water sample in a measuring tube, add the enclosed reagents and compare the resulting colour with the scale included in the delivery. The stronger the colour, the higher the chlorine content. The values 0.5, 1, 1.5, 2, 3 and 4 mg/l can be read directly on the colour scale. Possible uses of the test The test is particularly well suited for reliably checking the chlorine content in water without measuring devices, for example in: Swimming pools and bathing facilities to ensure that the disinfection value is within the optimum range Water treatment or monitoring, when chlorine needs to be checked as an indicator of hygienic water quality As the test works manually by colour comparison, no expensive measuring equipment is required and samples can also be tested on the go. The set includes approx. 70 analyses.

Testoval Chromate Test Kit – manual analysis of chromate content Complete Testoval Chromate color comparison test kit for fast manual analysis of chromate content in water in the concentration range of 0–5 mg/l Cr. The reagents included in the set are sufficient for approximately 180 analyses. The Testoval Chromate test kit from Heyl is a color comparison analysis device for the determination of chromate (CrO₄²⁻) in water. The measurement is carried out by a chemical reaction with the included reagents, which produce a color change. The sample is then compared with a scale in the color comparator, allowing the chromate value to be read easily and reliably. Advantages of the Chromate Color Comparison Test Kit from Heyl reliable results for routine checks easy handling for laboratory and field use fast determination through optical color comparison complete set with reagents and color comparator Possible Application Areas drinking and process water analysis monitoring of wastewater and environmental samples service and maintenance work on water systems laboratory and industrial testing Technical Data Number of analyses: approx. 180 Measurement time: approx. 3 minute The individual values 0.1 mg/l, 0.25 mg/l, 0.5 mg/l, 1 mg/l, 2.5 mg/l and 5 mg/l can be read by optical color comparison. The scope of delivery includes three reagents as well as a color comparator for simple concentration determination. Also available in our online shop Item number: 410533 Testoval Chromate Reagents Refill Pack Item number: 410534 Replacement Color Comparator

The Testoval Nitrite Test Kit is an analysis kit that allows you to determine the nitrite content in water visually by comparing colours. Simple nitrite test for your water samples With the Testoval Nitrite Test Kit, the nitrite content in water can be tested easily and visually. Water is poured into a cuvette of the test kit, the reagents are added, and the colour change in the water is then observed. The individual values of 0.05 mg/l, 0.1 mg/l, 0.2 mg/l, 0.3 mg/l, 0.5 mg/l and 1 mg/l can be read by visual colour comparison. By diluting the water sample in a ratio of 1:10 with distilled water, the measurement range can be extended to 10 times the concentration. This method is particularly suitable for quick on-site checks, e.g. in swimming pools, fountains or technical installations. Features of the test kit? The test kit allows you to determine the nitrite content in water without technical measuring equipment or electricity. It provides a measurement result within approximately 15 minutes. With one test kit, you can carry out approximately 100 analyses.

Testoval® pH Chlor DPD Test Kit – Color Comparison for pH and Chlorine Quick and reliable determination of pH value and free and total chlorine in water The Testoval pH-Chlor DPD Test Kit is designed for rapid manual analysis of pH and chlorine. The pH measurement range is 6.8–8.0, while the chlorine content is measured in the range of 0–1 mg/L. The values pH 6.8, 7.4, and 8.0 as well as 0.1 mg/L, 0.5 mg/L, and 1.0 mg/L chlorine can be read safely using optical color comparison. Original Heyl Test Kit for Rapid Determination of pH and Chlorine The Testoval® pH-Chlor DPD Test Kit from Heyl is an original color comparison kit for rapid manual analysis of pH and both free and combined (total) chlorine in water. It was specifically developed for the requirements of swimming pool water monitoring. Advantages of the Original Testoval® pH-Chlor DPD Test Kit The Testoval® pH-Chlor DPD Test Kit combines two important water parameters in one set (pH and chlorine), enabling particularly efficient water analysis. With a measurement time of approximately 3 minutes per test, around 70 measurements can be performed – ideal for routine monitoring during operation. As an original Heyl product, the test kit ensures high measurement reliability, reproducible results, and maximum reagent compatibility. It helps operators maintain stable water quality, control disinfection processes, and reliably meet hygienic standards. Frequently asked questions How long do Heyl chemicals last? The shelf life is printed on the label of each product. Upon delivery, the guaranteed shelf life is at least 7 months. Can Heyl reagents also be purchased individually? That depends on the specific item to be ordered. For Testoval products, only the complete refill pack can be ordered. The individual small bottles cannot be reordered separately. For the Duroval test kit, the individual components of the refill pack can also be reordered separately. Can the indicator and titration solution be purchased separately? Yes, this is possible for the Duroval product range. Where can I find the safety data sheet? The safety data sheet can be found directly with the product in our shop or separately in the download area under the relevant heading. How can the chemicals be disposed of? Disposal instructions can be found in section 13 of the safety data sheet. Disposal must be carried out in accordance with official regulations. Can the chemicals still be used after the expiry date? No, the chemicals can no longer be used after the expiry date. After the expiry date, accurate measurement results can no longer be guaranteed. How should Heyl chemicals be stored? Section 7 of the safety data sheet contains all relevant information on the storage of chemicals. The recommended storage temperature should be between 15-25°C.

Testoval pH Range 5.5 to 8 Test Kit The test kit covers a measuring range from pH 5.5 to pH 8 and allows easy reading of values via defined color levels. No electronic device is required when performing measurements with the test kit. The Testoval pH range 5.5 to 8 test kit from Heyl is a colorimetric color comparison set for fast and manual determination of pH value in water. It is particularly suitable for routine analyses where simple and reliable control without electronic measuring devices is required. By adding the included reagents, a characteristic color change of the water sample occurs. This is then visually compared with reference values using the color comparator. In this way, the pH value can be determined quickly and reliably. Scope of delivery of the test kit from Heyl The test kit contains all components required to carry out the analysis. These include reagents for the pH measurement reaction, the color comparator for visual evaluation, as well as measuring tubes, a measuring spoon, and a cuvette. This makes the test kit ready for immediate use and suitable for both stationary and mobile applications. Advantages of the Testoval pH test kit with measuring range 5.5 to 8 Thanks to the simple application via optical color comparison, fast manual determination of pH value in water is possible. No electronic measuring devices or power supply are required to operate the test kit. The test kit delivers reliable and precise results within a very short time. Application areas of the pH test kit from Heyl The Testoval pH test kit is suitable for various areas of water analysis, such as monitoring drinking and process water, supervising water treatment systems, routine checks in industry and laboratories, as well as quality control in environmental and process analysis. Technical Data Measuring range: pH 5.5 – 8 Readable values: 5.5 / 6 / 6.5 / 7 / 7.5 / 8 Number of analyses: approx. 250 Measurement time: approx. 1 minute Measurement principle: colorimetric color comparison Matching products such as the refill pack and replacement color comparator are also available in our shop: Item number: 410611 Testoval pH Range 5.5 to 8 - Reagents Refill Pack enables an additional 250 analyses Item number: 410612 Replacement Color Comparator

Testoval pH Range 8 to 12 Test Kit The Testoval pH test kit from Heyl with a measuring range of 8–12 is ready for immediate use and is suitable for both stationary and mobile applications. With the help of the color comparator, the values can be read quickly and easily. The Testoval pH range 8 to 12 test kit is a colorimetric color comparison set for fast manual determination of pH value in the alkaline range. It is ideal for applications where simple and reliable pH control is required without electronic measuring devices. By adding the included reagents, the water sample changes color according to its pH value. This color is then compared with reference values using the integrated color comparator, allowing the pH value to be determined quickly and visually. Your advantages with the Testoval pH range 8–12 test kit from Heyl Thanks to its compact and handy design, quick and easy determination of pH values in the alkaline range is possible. The test kit delivers reliable results through defined reference colors and is suitable for both mobile and on-site applications. Possible application areas of the test kit from Heyl The Testoval pH range 8–12 test kit is versatile and can be used in areas such as monitoring pH values in process and industrial wastewater, supervising water treatment systems, routine laboratory checks, and quality control. Technical Data Measuring range: pH 8 – 12 Readable values: 8 / 8.5 / 9 / 9.5 / 10 / 10.5 / 11 / 11.5 / 12 Number of analyses: approx. 200 Measurement time: approx. 1 minute Measurement principle: colorimetric color comparison Matching spare parts for the test kit are also available in our online shop: Item number 410617: Testoval pH range 8 to 12 reagents refill pack – reagents for additional analyses Item number 400618: Replacement color comparator pH 8–12 – replacement device for optical evaluation

Heyl Testoval Phosphate Test Kit – Measure Phosphate Quickly by Hand Colorimetric test kit for easy determination of phosphate (P₂O₅) in water The Heyl Testoval Phosphate Test Kit allows simple and reliable determination of phosphate content (P₂O₅) in water samples. Measurement is performed colorimetrically via a visual color comparison and covers a range of 0 to 10 mg/L. The kit is a practical color comparison set for manual analysis of phosphate in water samples. The color develops within minutes after adding the reagents. By diluting the water sample 1:10 with distilled water, the measurement range can be extended tenfold. The kit allows for approximately 180 analyses in total. Fast Phosphate Analysis in Water Using Color Comparison The colorimetric method enables rapid determination of phosphate without complex equipment. After adding the reagents, the resulting color intensity is compared with a reference scale, allowing direct reading of the phosphate level. Due to its simplicity, the kit is ideal for routine checks, spot measurements, and applications where fast and reliable results are required. Typical Applications of the Phosphate Test Kit Manual phosphate determination is important in many areas of water analysis, particularly where nutrient levels must be monitored. Breweries Environmental monitoring Advantages of Phosphate Measurement with a Heyl Test Kit The Heyl Test Kit provides a simple, fast, and cost-effective way to measure phosphate content in water samples without the need for electronic devices or laboratory infrastructure. The colorimetric method delivers meaningful results within minutes. The main advantage: immediate results, allowing on-site assessment of whether phosphate levels are within acceptable limits, enabling quick response when needed. This is particularly useful for routine checks, spot measurements, or emergency testing. Easy handling: No special training or equipment required Mobility: Ideal for field measurements and decentralized applications Low cost: No purchase or maintenance of electronic devices needed Reliability: Proven method for reproducible results Flexibility: Can be used where no electricity or lab is available Why Phosphate Measurement Is Essential Phosphate is a key nutrient in water, but high concentrations can cause significant ecological and technical problems. Even small excesses can lead to algae growth, oxygen depletion, and deteriorating water quality. Regular phosphate monitoring is critical for: Environmental monitoring: Protect water bodies from over-fertilization Water treatment: Ensure compliance with legal limits Industry & breweries: Maintain stable process and product quality Wastewater management: Monitor the performance of treatment plants The Heyl Phosphate Test Kit enables fast, reliable, and lab-independent monitoring on site, allowing early trend detection and targeted interventions.

Reliable manual determination of dissolved silicate in water Testoval Silicate Test Kit – color comparison for fast analysis The Testoval silicate test kit can be used in many areas, including the early detection of silicate deposits in systems. Silicate can lead to stubborn deposits and reduce the efficiency of systems, which is why regular monitoring is recommended. With the Testoval silicate test kit, the content of dissolved silicate in water can be determined easily and directly on site. The set works according to the principle of visual color comparison and is ideal for applications where fast and traceable results are required without complex measuring technology. It is suitable for the fast, manual analysis of silicate content in water in the concentration range of 0–10 mg/l SiO₂. The individual values 0.25 mg/l, 0.5 mg/l, 1 mg/l, 2.5 mg/l, 5 mg/l and 10 mg/l can be read by optical color comparison. After adding the reagents, the water sample reacts with a characteristic color development. This is then compared with the reference values of the color comparator, allowing the silicate concentration to be reliably estimated. Manual determination of dissolved silicates in water up to 10 mg/l By diluting the sample in a ratio of 1:10, the measurable range can be extended by a factor of 10. With the test kit, approximately 100 individual analyses can be performed. The analysis time is approx. 19 minutes per measurement. Your advantages with the Testoval silicate test kit The Testoval silicate test kit is ideal for the direct determination of dissolved silicate in water. It uses a visual measurement method, meaning no electrical device is required for measurement. The color comparator provides clear gradations for fast reading of values. The test kit is ideal for regular on-site and mobile checks. Application areas of the silicate test kit The test kit can be used in many different areas such as monitoring boiler feed water and steam systems, checking cooling and process water, use in reverse osmosis and treatment systems, as well as routine analyses in laboratories or technical service. The test kit can be used for early detection of deposits and system issues. Why is monitoring silicate in water so important? Dissolved silicates play a crucial role in industrial water treatment, especially in boiler feed water, cooling water, and reverse osmosis systems. Excessive silicate concentrations can lead to the formation of stubborn deposits (silicate scaling), which are difficult to remove and can significantly impair heat transfer and system efficiency. In membrane processes, silicate can also cause irreversible damage and significantly shorten membrane lifespan. Regular monitoring of silicate levels allows early detection of limit values, targeted control of treatment processes, and prevention of costly system damage. The Testoval silicate test kit therefore supports safe process control and long-term operational reliability. Technical Data Measurement parameter: silicate (SiO₂, dissolved) Measuring range: 0–10 mg/l SiO₂ Readable values: 0.25 / 0.5 / 1 / 2.5 / 5 / 10 mg/l Number of analyses: approx. 100 Measurement time: approx. 19 minutes Measurement principle: colorimetric color comparison Additional products available in our online shop Item number: 410623 Testoval silicate reagents refill pack – for approx. 100 additional analyses Frequently asked questions How long do Heyl chemicals last? The shelf life is printed on the label of each product. Upon delivery, the guaranteed shelf life is at least 7 months. Can Heyl reagents also be purchased individually? That depends on the specific item to be ordered. For Testoval products, only the complete refill pack can be ordered. The individual small bottles cannot be reordered separately. For the Duroval test kit, the individual components of the refill pack can also be reordered separately. Can the indicator and titration solution be purchased separately? Yes, this is possible for the Duroval product range. Where can I find the safety data sheet? The safety data sheet can be found directly with the product in our shop or separately in the download area under the relevant heading. How can the chemicals be disposed of? Disposal instructions can be found in section 13 of the safety data sheet. Disposal must be carried out in accordance with official regulations. Can the chemicals still be used after the expiry date? No, the chemicals can no longer be used after the expiry date. After the expiry date, accurate measurement results can no longer be guaranteed. How should Heyl chemicals be stored? Section 7 of the safety data sheet contains all relevant information on the storage of chemicals. The recommended storage temperature should be between 15-25°C.

Color comparison test kit TESTOVAL Sulfite for the concentration range 0–20 mg/l SO32-. The sulfite test kit is suitable for many application areas, including the control of oxygen scavengers (sulfite dosing). Regular monitoring helps to prevent corrosion in systems. For fast monitoring of sulfite in water, the Testoval sulfite test kit offers a practical solution without complex measuring technology. The set works with an optical color comparison and enables direct evaluation of the water sample – ideal for applications where ease of use and fast results are essential. After adding the reagents, a color reaction develops. This is compared with stored reference values in the color comparator, allowing the concentration to be determined reliably. The measuring range is 0–20 mg/l SO₃²⁻ and covers typical requirements in water monitoring. The individual values 0.5 mg/l, 1 mg/l, 2.5 mg/l, 5 mg/l, 10 mg/l and 20 mg/l can be read by optical color comparison. The scope of delivery includes two reagents as well as a color comparator for simple concentration determination. Advantages of the Heyl test kit for sulfite measurement The test kit offers a convenient solution for fast and simple sulfite determination on-site and on the go. It uses a visual measurement method, so no power supply is required. The color comparator allows easy and quick evaluation of reliable results thanks to its clear gradation. Possible application areas The test kit is suitable for various applications and is particularly relevant in areas where sulfite-related corrosion may occur. These include monitoring boiler feed water and steam systems, controlling oxygen scavengers (sulfite dosing), and use in cooling and process water systems. Technical Data Measurement parameter: sulfite (SO₃²⁻) Measuring range: 0–20 mg/l Readable values: 0.5 / 1 / 2.5 / 5 / 10 / 20 mg/l Number of analyses: approx. 150 Measurement time: approx. 3 minutes Measurement principle: colorimetric color comparison Additional products also available in our shop Item number: 410635 Testoval sulfite reagents refill pack – for approx. 150 additional analyses Item number: 410636 Replacement color comparator sulfite – for optical evaluation