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Kelway Soil pHD Acidity Meter MA-71 Kelway Soil pHD Acidity Meter provides a simple, cost-effective method of obtaining accurate soil pH measurements compared to litmus paper or a glass electrode meter. Simply insert the tester 2 inches into moist soil to determine the pH measurement within minutes. The MA-71 is handheld, ideal for periodic use, and requires no batteries to operate. The unit generates its own power via a small current between two metal plates. The meter has a pH range of 3 to 8, is accurate to ± .2 pH in acidic soils, and has an adjustment screw for periodic calibration.
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