Horiba LAQUA Twin Potassium K+ Compact Ion Meter (B-731)

SKU: B-731
Product Weight 1.50 Pounds
The Horiba LAQUA Potassium meter makes taking potassium readings extremely easy and cost effective. You simply simply place a 0.3ml sample onto the meter's flat sensor and measure. It features an automatic calibration system and waterproof construction.
Sales price $344.99
Additional Calibration Solutions
Replacement Sensor

Horiba LAQUA Twin Potassium K+ Compact Ion Meter (B-731)

Horiba_B-731_S2Brand new for 2013. The Horiba LAQUA Twin Potassium ion tester makes testing potassium extremely easy by simply placing a tiny sample on the meter's flat sensor. Accurate measurements can be taken from a sample as small as 0.3ml.

The meter is designed for general purpose potassium measurements. The Flat sensor technology enables measurements with only a few drops of sample. Measurements are simple, quick, and accurate. Using HORIBA's original flat sensor it can measure sample volumes as low as 0.3mL and uses a very simple 2 point automatic calibration procedure.


  • Simple, quick, and accurate measurements
  • Flat sensor technology enables readings with as little as 0.3 ml of sample
  • Waterproof construction
  • Automatic Calibration (selection of 1 point or 2 point calibration)
  • Wide measuring range for a variety of applications
  • Selectable display between ppm and mol/l.

Main Uses:

  • Measuring leaf sap,
  • Measuring soil potassium levels,
  • Measuring foliar and hydroponic fertilizers. 
  • Measuring concentrations in animal bodily fluids such as urine and saliva.
  • Measuring fruit juices and milk
  • Using the sample sheets as a swab, soaked in distilled water and wiping over a hard surface to measure surface potassiumlevels. 
Main Features

 The measurement process simply involves placing the sample on the meter's flat sensor. Accurate measurements can be taken from samples as small as 0.3 ml.

Automatic range switching gives a wide display range and facilitates highly precise measurements.

The meter employs a highly selective flat ion electrode. As it is unreceptive to other ions, the electrode takes highly accurate measurements of nitric acid ion concentrations. The new high molecular weight polymers are longer lasting and more resistant to contamination, giving you more troublefree service and saving money on replacements.

Ultrathin and lightweight, the meter can be easily carried to any location for on-site testing.


MODEL Horiba Cardy K+ Meter B-731
Principle Potassium ion electrode method
Display 4-digit digital LCD display
Guarantee range 39-3900 ppm (10-3-10-1 mol/l)*
Display range 0-99 x 100 ppm
Resolution 1 ppm for 0-99 ppm
10 ppm for 10-99 x 10 ppm
100 ppm for 10-99 x 100 ppm

±10% or ±10ppm whichever is larger against the standard solution.

Calibration 2-point calibration
Repeatability ±20% of display value
Sample temperature 5-35°C/41-95°F
(temperature compensated at ambient temperature)
Power CR-2025 lithium cell ( x 2)
approx.500 hrs continuous operation
Weight Approx.40g, 1.4oz
Dimensions 95 x 55 x 9mm,3.7 x 2.2 x 0.35in
Standard accessories K+standard solution
STD 2000 ppm, SLOPE 150 ppm
Deionized water, sampling sheet,
tweezers, pipet, instruction booklet
Selectivity coefficient (interfering ions) l-=7 x 10-10,  Cl-=4 x 10-2,  Br-=9 x 10-1, ClO4-=3 x 10-3, NO2-=7 x 10-1, pH range: pH 3-8 (at 10-3 mol/l)

 Unit Ship Weight: 1.5 Lb



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