Soil Potassium Meter

Measurement principle

Ion electrode method

Minimum sample volume

0.05 mL*1, 0.3 mL or more

Measurement range

39 to 3900 ppm (mg/L) (10-3 to 10-1 mol/L)
20 to 2000 kg/10a*2

Display range*3

0 to 9900 ppm (mg/L)

Range and Resolution

1) 0 to 1.0 ppm : 0.1 ppm
2) 0 to 99 ppm : 1 ppm
3) 100 to 990 ppm : 10 ppm
4) 1000 to 9900 ppm : 100 ppm

Calibration

Two-point*4

Accuracy*5

10% of reading value

Functions

Auto range change, Temperature compensation ,
IP67 Water/Dust proof*6, Auto hold
Automatic power off (30 minutes)

Display

Custom (monochrome) digital LCD

Operating temperature/ humidity

5 to 40^oC, 85% or less in
relative humidity (no condensation)

Power

CR2032 batteries (x2)

Battery life

Approx. 400 hours in continuous use

Main Material

ABS epoxy

Dimensions /Mass

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

Interfering ion influence Selectivity coefficient and pH range

Rb⁺= 1x10^-1/ Mg²⁺= 1x10^-5/ NH⁴⁺= 7x10^-3/
Ca²⁺= 7x10-7/ CS⁺= 4x10^-3/ Na⁺= 3x10^-4/
pH range: pH 2~9 at 10^-3 mol/L K⁺