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Compact Conductivity meter LAQUAtwin B-771



Water proof Micro Volume 2-point calibration


Determine water conductivity with as little as 0.12 mL of sample.
The conductivity of rain water is a trusted guide to determining atmospheric purity. In agriculture, measuring the conductivity of soil allows farmers and agronomists to determine optimum fertiliser usage and check the ‘health’ of soil after salt water damage. The LAQUAtwin meter makes conductivity testing simple, anywhere.
Applications include:
Fresh water testing (rain, rivers, lakes, hot springs); aquaria; soil testing for improved agriculture and analysis of salt water damage; analysis of surface cleanliness prior to coating; and improved paint adhesion.


  • Salt/TDS Measurement
  • Auto range change
  • Temperature conversion(2%/℃ fixed)
  • IP67 waterproof
  • Auto hold
  • Automatic power off(15 minutes)




Measurement principle

2 AC bipolar

sample volume

0.12mL or more

Measurement range

Conductivity:0 to 19.9mS/cm(0 to 1.99S/m)
Salt:0 to 1.1%
TDS:0 to 9900ppm

Display range

 0 to 199mS/cm (0 to 19.9S/m)*1

Range and Resolution
(Valid numbers)

①0 to 199 μS/cm :  1μS/cm 
②0.20 to 1.99mS/cm : 0.01mS/cm
③2.0 to 19.9mS/cm : 0.1mS/cm
④20 to 199mS/cm : 1mS/cm*1




±2%F.S.±1digit (for each range)*3


Salt/TDS Measurement・・Auto range change・Temperature conversion(2%/℃ fixed)・Waterproof*4・Auto hold・Automatic power off(15 minutes)


Custom (monochrome) Digital LCD


5 to 40˚C, 85% or less in relative humidity  (no condensation)


CR2032 batteries (x2)

Battery life

Approx. 400 hours in continuous use

Main Material

ABS epoxy


164mm × 29mm × 20mm  (excluding projections) / Approx. 45 g (meter only, without batteries)

Accessories included

2 CR2032 batteries/1 Pipette/Instruction manual/Quick manual/Storage case/Standard solution(1.41mS/cm)  (14mL)/Treatment reagent (14mL)
※For the high conductivity standard solution (12.9mS/cm) is sold separately.

*1 When the measured value is out of the measurement range, the displayed value blinks. It should be used only as a guide.
*2 Selectable between one-point and two-point calibrations. High conductivity standard solution (12.9mS/cm) is sold separately.
*3 Repeatability in measurement of a standard solution after calibration using the same standard solution.①±5μS/cm (0 to 199 μS/cm )②±0.05mS/cm(0.20 to 1.99mS/cm)③±0.5mS/cm (2.0 to 19.9mS/cm)
*4 IP67:no failure when immersed in water at a depth of 1 meter for 30 minutes. But the product can not be used underwater.