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  • HORIBA to Supply Water Quality Sensor to NASA

HORIBA received an order from the United States National Aeronautics and Space Administration (NASA), to supply water quality sensors to be used in the medical intravenous (IV) fluid production device... Read more

- Enabling the intravenous fluid production in the space

LAQUAtwin B-751


Ca+ Temperture  
Water proof Micro Volume 2-point calibration  


The only pocket meter that directly measures calcium ion concentration in 0.3ml sample (or 0.05ml sample with sampling sheet B). Unique sensor allows measurement of viscous liquids, solids, and even powder samples. No need for a beaker to calibrate your meter or measure a sample. Just place few drops of the standard or sample onto the flat sensor. This procedure saves you time and prevents wasting your precious sample.

  • Minimum sample volume: 0.3ml (0.05ml with sampling sheet B)
  • Up to 2 calibration points
  • Auto standard recognition: 150 & 2000ppm calcium (default)
  • Changeable low calibration value
  • Multiplication compensation: 0.01 to 9.90
  • Adding compensation: -1000 to 1000
  • Temperature and mV display
  • Auto stable / auto hold measurement
  • Auto power off: 30mins.
  • Low battery indicator
  • IP67 Rating dust & waterproof
  • Replaceable sensor
  • 400 Hours battery life: continuous use
  • Material: ABS epoxy
  • Display: custom (monochrome) digital LCD
  • Operating conditions: 5 to 40 ºC, 85% or less relative humidity
  • Warranty: 2 years - meter, 6 months - sensor
  • Packed in handy carrying case
  • Supplied with 150 & 2000ppm calcium standards, 5 x sampling sheets B, 2 x CR2032 batteries, dropper, instruction and quick manuals 

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Measurement Principle

Ion Selective Electrode

Minimum Sample Volume

0.3ml (0.05ml with sampling sheet B)

Measurement Range

40 to 4000 ppm (mg/L)

Display Range

0 to 9900 ppm (mg/L)


0 to 99 ppm: 1 ppm

100 to 990 ppm: 10 ppm

1000 to 9900 ppm: 100 ppm


± 20% of actual value

Calibration Points

Up to 2

Temperature Display

0 to 50.0 ºC


Custom (monochrome) digital LCD

Operating Temperature

5 to 40.0 ºC

Operating Humidity

85% or less relative humidity (no condensation)


CR2032 batteries (2)

Battery Life

Approx. 400 hours in continuous use


ABS epoxy


164 x 29 x 20 mm (excluding projections)


Approx. 55 g (including sensor and batteries)


  • Auto Standard Recognition
  • Changeable Low Calibration Value
  • Multiplication Compensation
  • Adding Compensation
  • Auto Hold / Auto Stable Measurement
  • Automatic Power Off (30mins)
  • Low Battery Indicator
  • IP67 Dust / Waterproof
  • Replaceable Sensor

Instruction Manuals (Videos)