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  • Autocalibration function
  • Accuracry: ±10% of reading value
  • Auto range change
  • Measurement range:
    • 39 to 3900 ppm(mg/L)
    • 20 to 2000 kg/10a*2
  • Temperature compensation
  • IP67 waterproof
  • Auto hold
  • Automatic power off (30min)
  • Soil and sap testing

The Horiba B-731 LAQUAtwin Potassium Ion Meter is the only compact meter for a quick measurement of potassium ion using ion selective membrane. Flat sensor technology and 60 years of sensor engineering realizes a reliable and direct measurement of a drop of the sample from 0.3mL. Use sampling sheet (sold separately) to measure down to 0.05mL or more.Unique sensor mechanism realizes direct measurement of solid, viscous, powder samples. No need for a beaker to calibrate or measure. Just drop the standards and sample on the flat sensor, saves you time and minimize wasting your precious sample.This lightweight, pocket-sized meter is suitable for research and industrial applications in diverse fields.


Horiba Potassium Ion Standard Solution 2000ppm
Potassium Ion 2000ppm, 14mL 6 bottles
Horiba Y031L Potassium Ion Standard Solution 150ppm
Potassium Ion 150ppm, 14mL 6 bottles


Please consider these optional accessories.

Horiba S030 Potassium Ion Electrode
Flat electrode for potassium ion which is so selective that pH or other ions do not affect it


This product can be used in the following applications: