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Kelway Meter Acidity Tester. Soil pH meter – From the same great maker of the HB2 meter, comes the soil PHD, a lighter-duty version tester that is just as accurate as the HB2. Accurate to within a +/- .2 pH in acidic soils. Lasts for years when properly cared for. The PHD is scientific and does not operate on batteries. Use in slightly moistened soil to get readouts you can depend on. 6.25′ long overall, probe is 1 and 7/8′ long. Blue plastic housing. Does not measure moisture like the HB2. Kelway Meter Acidity Tester