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Product information "Horiba LAQUAtwin ORP Tester with 1 calibration point and temperature measurement (ORP-11)"

HORIBA LAQUAtwin Redox Tester with 1 Calibration Point and Temperature Measurement (ORP-11)

Discover the HORIBA Redox Pocket Tester ORP-11: Your reliable solution for accurate redox measurements. The ORP-11 sets new standards in water analysis with its exceptional product quality, Made in Japan, and unique user benefits. This model is a suitable solution for a wide range of users, whether in professional laboratories, industry, aquaculture or hobby gardening.

The waterproof design of the ORP-11, the ability to analyze small sample volumes from 0.3 ml (0.05 ml with Sampling Sheet B), easy handling and straightforward sensor replacement are its key features. These characteristics ensure that it can be used for many years.

It offers a measurement range of -1000 to 1000 mV and a resolution of 1 mV, providing the flexibility and precision required for specialized redox measurements.

Versatile Measurement Methods of the HORIBA ORP-11

The advantages of the ORP-11 in different application areas include:

Immersion

Ideal for laboratory use, where the tester can be immersed directly into a beaker or measuring cup for measurement.

Scoop

The specially designed flip-top cover can be used to scoop water samples from rivers or tanks.

Drops

Perfect for measuring very small liquid volumes, starting from 0.1 ml and even as low as 0.05 ml when using Sampling Sheet B.

Wipe

By wiping surfaces such as skin with a moistened Sampling Sheet, even the smallest sample quantities can be analyzed.

Solid Samples

Place moisture-containing food samples directly onto the sensor for analysis.

Powders

Dry powders can be analyzed by placing them onto the sensor and mixing them with a specified amount of water.

HORIBA testers are characterized by their versatility and flexibility for different measurement situations. The ABS epoxy housing and platinum disc sensor ensure that every model in the HORIBA Redox Pocket Tester series is designed to be user-friendly and durable.

Choose the HORIBA ORP-11 to experience an exceptional combination of accuracy, reliability and ease of use. This takes your redox measurements to a higher level.

Manufacturer's Article Number: 3200965260

LAQUAtwin ORP-11: The World's First Pocket-Sized ORP and Eh Meter

Your Mobile Laboratory – for On-Site Use: Ideal for water quality testing in swimming pools, environmental testing and many other applications.

HORIBA's unique compact meter integrates the electrode, display and sample container to enable simple, effective on-site testing through direct measurement with just a single drop.

Technical Features and Benefits

  • Versatile Measurement: The only pocket-sized ORP meter that can measure not only ORP but also Eh values (voltage measurement relative to the Standard Hydrogen Electrode or SHE).
  • Precision in Every Drop: The replaceable platinum disc sensor enables measurements in samples as small as 0.3 ml (or 0.05 ml with a Sampling Sheet).
  • Wide Measurement Range: With a measurement range of -1000 mV to 1000 mV, the meter ensures accurate readings across a broad spectrum.
  • Easy Automatic One-Point Calibration: The meter automatically recognizes and calibrates using the included 225 mV standard solution. Calibration can be adjusted using another ORP standard solution.
  • Exceptional Accuracy: With an accuracy of +/- 2 mV, the meter delivers precise results every time.
  • Auto Stable & Auto Hold Measurement Modes: To assist users in recording stable readings, the meter displays a smiley indicator and can freeze the measured value.
  • Temperature Compensation and Calibration: The meter displays temperatures up to 50.0 °C and enables temperature compensation and correction through its calibration function.
  • IP67 Rating: Waterproof and dustproof meter with a digital LCD display and backlight.
  • Complete Package for On-the-Go ORP Testing: Each ORP-11 meter is supplied with a 225 mV ORP standard solution (14 ml), a cotton swab for polishing the platinum disc, a pipette and 5 Sampling Sheets. Batteries are no longer included with newly manufactured products from November 2026.

Additional Information

We would like to inform you about an upcoming product update for the LAQUAtwin pocket meters.

To enhance product safety and prevent accidental swallowing of batteries by infants and young children, HORIBA will introduce a new battery cover for all LAQUAtwin pocket meters.

Overview of the Product Change

  • Change: Battery cover for increased safety.
  • Reason: Prevention of accidental swallowing of batteries.
  • Production Date: From January 2026 in Japan.

As this change is currently being implemented, mixed deliveries of the current and updated versions may occur during the transition period.

Note on Scope of Delivery

From November 2026, HORIBA products will be delivered without batteries. Existing stock may still contain batteries. Batteries are no longer included with newly manufactured products and must be purchased separately if required.

Technical data
Measuring principle:  ORP electrode 
Minimum sample volume: 0.3 ml (0.05 ml with sampling sheet B)
ORP measuring range / resolution: -1000 to 1000 mV / 1 mV
Accuracy: ± 2 mV
Maixed calibration points:  1
Temperature display / resolution: 0 to 50.0 °C / 0.01 °C

 

Functions

- ORP and Eh measurements
- Automatic standard detection 
- Automatic / user-defined calibration values 
- Temperature compensation 
- Temperature calibration 
- Auto-hold / auto-stable measurement modes
- Automatic switch-off (30 min.) 
- Low battery indicator 
- IP67 water and dust proof
- Replaceable sensor 
Display:  Custom (monochrome) digital LCD with backlight 
Operating temperature / humidity:  5 to 40.0 °C / 85% or less relative humidity (no condensation)
Battery life:  approx. 400 hours of continuous operation without backlight 
Material: ABS epoxy housing / platinum disk sensor 
Dimensions: 164 x 29 x 20 mm (without protrusions)
Weight: approx. 55g (including sensor and battery)

 

Included accessories

- 225 mV ORP standard (14 ml)
- Lint-free cotton swab 
- CR2032 batteries (2 pcs.)
- Pipette
- Instructions for use & short manual 
- Storage case
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Replacement sensor, calibration standards and accessories

Horiba LAQUAtwin S080-ORP Redox replacement sensor, side view with ORP logo and flip tip for ORP-11 tester.
Horiba LAQUAtwin S080-ORP Redox Replacement Sensor for ORP-11 tester
Article number: 895694

The HORIBA LAQUAtwin Pocket Tester series provides a comprehensive solution for immediate and precise measurement of water quality parameters directly in the field. To ensure these measurements remain reliable and accurate, it is essential to regularly check the sensors and, if necessary, replace them with spare sensors. The replacement sensors, specifically designed for the HORIBA LAQUAtwin series, cover a wide range of types for various measurements: pH, conductivity, salinity, redox (ORP), as well as ion-selective sensors for sodium, potassium, nitrate, calcium, and fluoride. Each sensor is engineered to maximize user-friendliness and accuracy, for which HORIBA is globally recognized in water quality testing. HORIBA replacement sensors ensure that users’ devices consistently deliver optimal performance and precise measurements. Advantages of HORIBA Replacement Sensors: Easy Replacement: Sensors can be quickly replaced, allowing measurements to continue without delay. High Accuracy: Replacement sensors ensure that results are exact and reliable. Comprehensive Measurement Range: Various sensor types are available to cover a wide range of water quality parameters. Durability: Sensors are designed for long service life under challenging conditions. Sensor Replacement Instructions: Follow these steps when replacing the sensor to maintain the longevity and accuracy of your HORIBA LAQUAtwin Pocket Tester: Removing the Sensor: Turn off the tester. Move the sensor slightly away from the device and lift the sensor tip. Detach the sensor completely from the tester. Installing the Sensor: Ensure the tester is turned off. Make sure the waterproof gasket is clean and intact. Mount the sensor onto the tester so that hook “A” on the back of the device fits into hole “a” on the sensor tip. Ensure the waterproof gasket is not twisted. Important: After replacing the sensor, follow the steps in the user manual of the respective tester to make the device ready for accurate measurement. (These manuals are available with the products. Calibration and, if necessary, conditioning are usually required.) How can I check if my sensor shows signs of wear? Check the sensor condition as follows: Perform a 2-point calibration. If an error occurs during calibration, this indicates that the sensor has deteriorated. In this case, it is advisable to replace the sensor. Regular checks and timely sensor replacement ensure that water quality measurements performed with the HORIBA LAQUAtwin Pocket Testers remain highly accurate and reliable. Manufacturer Part Nr. 3200997083

€79.00
Horiba Redox 255 mV pH/ORP calibration solution, compact form.
Horiba Redox 255 mV Buffer Solution (514-ORP-225)
Article number: 895696

To accurately calibrate and maintain the HORIBA LAQUAtwin Pocket Testers, HORIBA provides a special selection of buffer, calibration and standard solutions. A convenient pack size of 6 x 14 ml of these solutions meets the requirements of the pocket testers as only a few drops are needed for calibration. This specific pack size helps to reduce waste and optimize efficiency during regular calibrations. The solutions available cover a variety of measurement ranges, allowing users to select the appropriate solution to suit their individual analysis or measurement needs: - pH buffer solutions: Solutions with pH values of 4.01 or 7.00 are available to calibrate the pH measurement. With these buffers it is possible to precisely regulate and control the pH measurement function of the LAQUAtwin Pocket Tester.- Conductivity standard solutions: 1413 μS/cm standard solutions ensure that the conductivity measurement of your devices is carried out precisely.- NaCl standard solutions: 0.5% or 5.0% NaCl solutions are available for the calibration of salinity measurement.- Ion standard solutions: HORIBA provides standard solutions to calibrate ion selective measurements. HORIBA provides standard solutions for sodium, potassium, nitrate and calcium, available in different concentrations: from low (e.g. 150 ppm) to high concentrations (e.g. 5000 ppm).- Fluoride ion standard solutions: For the calibration of fluoride measurements, HORIBA offers standard solutions with concentrations of 1 ppm and 10 ppm.- TISAB solution: A special solution for use with fluoride ion standard solutions to adjust the ionic strength of the sample for precise fluoride measurements.- ORP standard solution: For the calibration of redox measurements (ORP), HORIBA offers a solution with a redox potential of 225 mV. With these special solutions, the HORIBA LAQUAtwin pocket testers always provide accurate and reliable measurement results. The integrity of their measurement data and the lifetime of their devices can be ensured by regular calibration with these specifically formulated solutions. It is of great importance to select the appropriate calibration solution and standard solution to maintain the accuracy of measurements and ensure the reliability of water quality measurements in various applications. Manufacturer Part No. 3200997084

€59.00
HORIBA Redox 200 mV buffer solution, 250 ml, angled view of the hygienic bottle, safe calibration solution, ORP electrode calibration, high-quality measuring solution
HORIBA ORP 200mV (±5mV @25°C) buffer solution 250ml (250-ORP-200)
Article number: 895972
ORP Buffer: 200 mV (±5mV @25°C) | Size of bottle: 250 ml

Explore HORIBA's premium profile solutions for pH, ORP and conductivity measurements, specifically designed for handheld and laboratory meters. Our solutions are designed to meet the needs of different users and ensure that your measurements are accurate. Here are a few of our products that provide a clear overview and easy selection: - pH standard solutions are available in different pH value classes: e.g. 4.01, 7.00, 10.01. These solutions are indispensable for the calibration of pH electrodes and have a high degree of accuracy. - Redox standard solutions (ORP): These solutions offer values from 200 mV to 650 mV, enabling precise adjustment of redox electrodes. Standard solutions for conductivity: These are used to calibrate conductivity sensors and are available in different conductivity ranges. - Internal filling solutions: These solutions are specially designed for pH and reference electrodes and ensure optimum functionality as well as a long service life for your electrodes. Users:- Our NIST-traceable hygienic bottle solutions are ideal for environmental laboratories using pH and ORP buffer solutions to monitor water quality in natural waters. They enable safe and accurate calibration without the risk of contamination. - Our buffer solutions provide a reliable basis for compliant results in the pharmaceutical industry, where accurate pH measurements are critical for drug formulation and quality control. - Our pH and redox solutions are of great importance to the food and beverage industry and play a crucial role in the quality of products, from wine production to milk processing. - Our solutions are used by research institutions and universities to conduct their scientific experiments and train the next generation of scientists. - Our conductivity standard solutions are used by water treatment plants to improve their purification and filtration processes. Manufacturer information: Because HORIBA is synonymous with quality and precision, you can trust our professional solutions to complement your measurement equipment and extend its life. HORIBA's innovative hygienic bottles differ significantly from conventional bottles as they allow contamination-free removal by simply squeezing. As the lower part of the bottle always remains fresh and untouched, it is particularly advantageous for applications where cleanliness and accuracy are crucial. Use HORIBA solutions to ensure the accuracy of your measurements and promote the functionality of your measuring devices. HORIBA High quality ORP buffer solution for calibration of your ORP electrodes The 250 ml and 500 ml bottle is characterized by a special hygienic closure, which protects the ORP buffer solution from contamination. To provide the required buffer, simply squeeze the bottle together and enough buffer solution is delivered to the upper part of the bottle to perform a calibration.

€33.00
HORIBA Redox 475mV buffer solution bottle, front view with label, 250ml hygiene bottle, calibration solution, contamination-free dispensing
HORIBA ORP 475mV (±5mV @25°C) buffer solution 250ml (250-ORP-475)
Article number: 895973
ORP Buffer: 475 mV (±5mV @25°C) | Size of bottle: 250 ml

Explore HORIBA's premium profile solutions for pH, ORP and conductivity measurements, specifically designed for handheld and laboratory meters. Our solutions are designed to meet the needs of different users and ensure that your measurements are accurate. Here are a few of our products that provide a clear overview and easy selection: - pH standard solutions are available in different pH value classes: e.g. 4.01, 7.00, 10.01. These solutions are indispensable for the calibration of pH electrodes and have a high degree of accuracy. - Redox standard solutions (ORP): These solutions offer values from 200 mV to 650 mV, enabling precise adjustment of redox electrodes. Standard solutions for conductivity: These are used to calibrate conductivity sensors and are available in different conductivity ranges. - Internal filling solutions: These solutions are specially designed for pH and reference electrodes and ensure optimum functionality as well as a long service life for your electrodes. Users:- Our NIST-traceable hygienic bottle solutions are ideal for environmental laboratories using pH and ORP buffer solutions to monitor water quality in natural waters. They enable safe and accurate calibration without the risk of contamination. - Our buffer solutions provide a reliable basis for compliant results in the pharmaceutical industry, where accurate pH measurements are critical for drug formulation and quality control. - Our pH and redox solutions are of great importance to the food and beverage industry and play a crucial role in the quality of products, from wine production to milk processing. - Our solutions are used by research institutions and universities to conduct their scientific experiments and train the next generation of scientists. - Our conductivity standard solutions are used by water treatment plants to improve their purification and filtration processes. Manufacturer information: Because HORIBA is synonymous with quality and precision, you can trust our professional solutions to complement your measurement equipment and extend its life. HORIBA's innovative hygienic bottles differ significantly from conventional bottles as they allow contamination-free removal by simply squeezing. As the lower part of the bottle always remains fresh and untouched, it is particularly advantageous for applications where cleanliness and accuracy are crucial. Use HORIBA solutions to ensure the accuracy of your measurements and promote the functionality of your measuring devices. HORIBA High quality ORP buffer solution for calibration of your ORP electrodes The 250 ml and 500 ml bottle is characterized by a special hygienic closure, which protects the ORP buffer solution from contamination. To provide the required buffer, simply squeeze the bottle together and enough buffer solution is delivered to the upper part of the bottle to perform a calibration.

€33.00
HORIBA Redox 200 mV buffer solution, 250 ml, angled view of the hygienic bottle, safe calibration solution, ORP electrode calibration, high-quality measuring solution
HORIBA ORP 650mV (±5mV @25°C) buffer solution 500ml (500-ORP-650)
Article number: 895975
ORP Buffer: 650 mV (±5mV @25°C) | Size of bottle: 500 ml

Explore HORIBA's premium profile solutions for pH, ORP and conductivity measurements, specifically designed for handheld and laboratory meters. Our solutions are designed to meet the needs of different users and ensure that your measurements are accurate. Here are a few of our products that provide a clear overview and easy selection: - pH standard solutions are available in different pH value classes: e.g. 4.01, 7.00, 10.01. These solutions are indispensable for the calibration of pH electrodes and have a high degree of accuracy. - Redox standard solutions (ORP): These solutions offer values from 200 mV to 650 mV, enabling precise adjustment of redox electrodes. Standard solutions for conductivity: These are used to calibrate conductivity sensors and are available in different conductivity ranges. - Internal filling solutions: These solutions are specially designed for pH and reference electrodes and ensure optimum functionality as well as a long service life for your electrodes. Users:- Our NIST-traceable hygienic bottle solutions are ideal for environmental laboratories using pH and ORP buffer solutions to monitor water quality in natural waters. They enable safe and accurate calibration without the risk of contamination. - Our buffer solutions provide a reliable basis for compliant results in the pharmaceutical industry, where accurate pH measurements are critical for drug formulation and quality control. - Our pH and redox solutions are of great importance to the food and beverage industry and play a crucial role in the quality of products, from wine production to milk processing. - Our solutions are used by research institutions and universities to conduct their scientific experiments and train the next generation of scientists. - Our conductivity standard solutions are used by water treatment plants to improve their purification and filtration processes. Manufacturer information: Because HORIBA is synonymous with quality and precision, you can trust our professional solutions to complement your measurement equipment and extend its life. HORIBA's innovative hygienic bottles differ significantly from conventional bottles as they allow contamination-free removal by simply squeezing. As the lower part of the bottle always remains fresh and untouched, it is particularly advantageous for applications where cleanliness and accuracy are crucial. Use HORIBA solutions to ensure the accuracy of your measurements and promote the functionality of your measuring devices. HORIBA High quality ORP buffer solution for calibration of your ORP electrodes The 250 ml and 500 ml bottle is characterized by a special hygienic closure, which protects the ORP buffer solution from contamination. To provide the required buffer, simply squeeze the bottle together and enough buffer solution is delivered to the upper part of the bottle to perform a calibration.

€42.00