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. Applications include:
Soil and sap testing for improved agriculture; food testing*
* Detection of ions in water only; electrolytes in oils cannot be measured. Ion measurement can be affected by non-target ions. 
Features
Specifications
MODEL | B-731 |
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Measurement principle | Ion electrode method |
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| Minimum
sample volume | 0.3mL or more*1 |
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| Measurement range | 39 to 3900 ppm(mg/L)(10-3 to 10-1 mol/L)
20 to 2000 kg/10a*2 |
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| Display range | 0 to 9900ppm(mg/L)*3 |
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| Range and Resolution
(Valid numbers) | ?0 to 1.0ppm : 0.1ppm
?0 to 99ppm : 1ppm
?100 to 990ppm : 10ppm
?1000 to 9900ppm : 100ppm |
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| Calibration | Two-point*4 |
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| Accuracy | ±10% of reading value.*5 |
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| Functions | Auto range change?Temperature compensation?Waterproof*6?Reading locking ?Automatic power off ?30 minutes? | Display | Custom (monochrome) Digital LCD |
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| Operating
temperature/humidity | 5 to 40?C, 85% or less in relative humidity (no condensation) |
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| Power | CR2032 batteries (x2) |
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| Battery life | Approx. 400 hours in continuous use |
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| Main Material | ABS epoxy |
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| Dimensions
/Mass | 164mm × 29mm × 20mm (excluding projections)?/ Approx. 50 g (meter only, without batteries) |
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| Accessories included | 2 CR2032 batteries/1 Pipette/Instruction manual/Quick manual/Storage case/Standard solution
(150ppm&2000ppm)(14mL)/5 pieces of Sampling sheetB |
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*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 With soil/water sampling ratio of 1:5.
*3 When the measured value is out of the measurement range, the displayed value blinks. It should be used only as a guide.
*4 Selectable between one-point and two-point calibrations.
*5 Repeatability in measurement of a standard solution after calibration using the same standard solution.
*6 IP67?no failure when immersed in water at a depth of 1 meter for 30 minutes. But the product can not be used underwater. 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. Please see the Interfering ion influence ? pH range for further details.
Related Products
| Potassium Ion Sensor S030 |  |
| Standard solution ?Potassium Ion 2000ppm) Y031H |  |
| Standard solution ?Potassium Ion 150ppm? Y031L |  |
| Sampling sheet B Y046 |  |
| Sampling sheet holder (for LAQUAtwin) Y048 | %20Y048.jpg) |
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