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Home  >>  Products  >>  pH & Conductivity  >>  LAQUAtwin

LAQUAtwin Compact Water Quality Meter


The LAQUAtwins are compact water quality meters that can read pH, conductivity, ions and salinity. They can accurately display readings from only a single drop, in a few seconds. They can be calibrated, measure at the touch of a button and are fully waterproof and dustproof (IP67 rated).

LAQUAtwin Compact Water Quality Meter


  • Easy measurement for all users
  • IP67 rated waterproof and dustproof.
  • Sensor is easily replaceable
  • Strap hole allows you to attached strap or tag
  • Simple to use
  • Auto calibration made easy with one button, complete when mark stops flashing
  • Stability mark lights up when measurement is complete
  • Temperature alarm flashes when temp is out of range
  • Voltage measurment mode displays voltage
  • Measurement value flashes when the measurement calue is out of range
  • Measurement mark stops flashing when measurement is complete
  • Sensor guard protects sensor
  • Measurement Methods:
    • Drops -Drop a sample with a pipette, small volume as 0.1mL can be measured. Using sampling sheet B (optional), volumes down to 0.005 mL can be tested.
    • Immersion - When you're in the lab, you can test the sample in a beaker. Ensure the sensor guard sliding cap is open.
    • Scoop - Use as a scoop to test water e.g. from a river. Vertical scoop from a aquarium is also
      available with unique sensor guard.
    • Wipe - The sampling sheet allows tiny trace volumes to be analyzed. For example, wipe off the surface of the skin with a sampling sheet soaked with pure water and measure.
    • Solid Samples - Foods containing some moisture can be tested by placing a small piece directly onto the sensor.
    • Powders - LAQUAtwin meters can also test dry powders. Simply place the powder sample onto the sensor and drop on a constant amount of pure water.
    • Paper, textiles and films - To test sheets of paper and textiles, cut up the sample into small pieces and place directly onto the sensor. Drop on a constant amount of pure water.

LAQUAtwin Compact Water Quality Meter Diagram

Technical Data

Technical Data
  pH Conductivity (EC) Salt 11 EC Sodium Ion
Calcium Ion
Model: pH-22 B-771 B-721EC B-722 B-751
Measurement Principle: Glass electrode method 2 AC bipolar 2 AC bipolar Ion electrode method
Min Sample Volume: 0.05 mL*2 or 0.1 mL more*2 0.12 mL or more 0.12 mL 0.05 mL *2, 0.3 mL or more
Measurement Range: 2 to 12 pH Conductivity:
0 to 19.9mS/cm
(0 to 1.99S/m)
Salt: 0 to 1.1%
TDS: 0to 9900 ppm
0.0 - 100.0 g/L salinity 0.00 to 10.00% 23 to 2300 ppm (mg/L) (10-3 to 10-1 mol/L) 40 to 4000 ppm (mg/L) (10-3 to 10-1 mol/L)
Calibration: Three-point Two-point
Accuracy*6: ±0.1 pH ±2%F.S. ±1 digit (for each range)*7 ±10% of reading value ±20% of reading value
Functions: Temp compensation - Auto hold - IP67 Water/Dust proof *8 Salt/TDS Measurement - Temp conversion (2%/°C fixed) - Auto hold - IP67 Water/Dust proof *8 Auto stable Automatic Power Off (30 min) Temp Compensation - Auto hold - IP67 Water/Dust proof *8 Temp Compensation - Auto hold - IP67 Water/Dust proof *8
Operating Temp/Humidity: 5 to 40°C, 85% or less in relative humidity (no condensation)
Power: CR2032 batteries (x2)
Dims/Mass: 164 mm x 29 mm x 20 mm (excluding projections) / Approx. 50g (meter only without batteries, B771 approx 45 g) 6.5" x 1.1" x 0.8"
  • *1 Special application packages for crop measurement (B-741) and soil measurement (B-742) are also available
  • *2 Smaller amount (0.05 mL or more) can be measured with the sampling sheet B. (Please close the light shield cover. If a sample that contain particulate, please use "Sampling sheet holder" (sold Separately))
  • *3 With soil/water sampling ratio of 1:5.
  • *4 When the measured value is out of the measurement range, the displayed value blinks. It should be used only as a guide
  • *6 Repeatability in measurement of a standard solution after calibration using it.
  • *7 -±5 µS/cm (0 to 199 µS/cm) -±0.05 mS/cm (0.20 to 1.99 mS/cm) - ±5 mS/cm (20 to 199 mS/cm)
  • *8 IP67: no failure when immersed in water at a depth of 1 meter for 30 minutes. But the product can not be used underwater.


LAQUAtwin Compact Water Quality Meter Diagram



Prices subject to change    Prices listed in US dollars for domestic shipments within US, Canada, & Mexico only    Export orders require quotations - click here for a quote     For more info call us 1-800-762-2478 or 954-946-9454.
Item Number Item Prices

pH Meter (pH-22) - Meter, electrode, 14mL 7 Buffer, 14mL 4 Buffer, case

Conductivity Meter (B-771) - Meter, electrode, 14mL 1.41mS/cm standard, case

Salt 11 EC Meter B-721EC - Meter, electrode, 2 CR2032 batteries, 1 pipette, Instruction manual, Quick manual, 2 14mL Sodiumchloride Std. solutions, 14mL Conditioning solution, carry case

Sodium Ion Meter B-722 - Meter, electrode, 14mL 2000ppm, 14mL 150 ppm, case

Calcium Ion Meter B-751 - Meter, electrode, 14mL 2000ppm, 14mL 150 ppm, case

PH-383715 LAQUAtwin pH-22 pH Meter, w/electrode and standards $150.00
CD-383771 LAQUAtwin B-771 Conductivity Meter, w/cell and standards 394.00
15014 LAQUAtwin B-721EC Salt 11 EC Meter, w/electrode and standards 386.00
CD-383751 LAQUAtwin B-751 Calcium meter, w/electrode and Standards 471.00
CD-383722 LAQUAtwin B-722 Sodium meter, w/electrode and Standards 412.00


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