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Kelway Soil pH and Moisture Meter A sensitive electrode measures pH values from 3.5 to 8, soil moisture from 0 to 100%. Requires no chemical, distilled water, or outside electric power source. Numerous readings can be easily taken over a large area. 6-1/2”L. Leather-like case with belt loop, conditioning film, and full instructions included. pH Accuracy: ±0.2. Moisture accuracy: ±10%.