Compact Water Quality Meter – Sodium
Compact Water Quality Meter – Sodium
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Compact Water Quality Meter – Sodium



Only compact meter for a quick measurement of sodium 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.

Applications include soil and sap testing for improved agriculture, and food testin.g*

* Detection of ions in water only; electrolytes in oils cannot be measured. Ion measurement can be affected by non-target ions.


Model B-722

Measurement principle Ion electrode method
Minimum sample volume 0.3mL or more1
Measurement range 23 to 2300 ppm(mg/L) (10-3 to 10-1 mol/L)
Display range 0 to 9900ppm(mg/L) 2
Range and Resolution (Valid numbers) ①0 to 1.0ppm : 0.1ppm
②0 to 99ppm : 1ppm
③100 to 990ppm : 10ppm
④1000 to 9900ppm : 100ppm
Calibration Two-point3
Accuracy ±10% of reading value.4
Functions Auto range change・Temperature compensation・Waterproof5・Reading locking ・Automatic power off (30 minutes)
Display Custom (monochrome) Digital LCD
Operating temperature/ humidity 5 to 40˚C, 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 164mm × 29mm × 20mm (excluding projections)/ Approx. 50 g (meter only, without batteries)
Accessories included 2 CR2032 batteries/1 Pipette/Instruction manual/Quick manual/Storage case/Standard solution (150ppm&2000ppm) (14mL)/5 pieces of Sampling sheetB

1 Smaller amount(0.05mL or more) can be measured with the sampling sheet B. (Please close the light shield cover. If a sample that contain particulate, please use ”sampling sheet holder” - sold separately.)
2 When the measured value is out of the measurement range, the displayed value blinks. It should be used only as a guide.
3 Selectable between one-point and two-point calibrations.
4 Repeatability in measurement of a standard solution after calibration using the same standard solution.
5 IP67:no failure when immersed in water at a depth of 1 meter for 30 minutes. But the product can not be used underwater.

Attention: The ion electrode may be subject to interference from other ionic species. The selectivity coefficient reflects the affinity between each ionic species and the electrode, and is used to correct for the influence of competing ions.