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ETP303 2 IN 1 Soil Fertility pH Meter
*Give accurate results of the PH and Fertility of the soil
*No batteries required
*The Ph portion of the tester utilizes the chemical reaction known as oxidation-reduction to measure PH within the range of 1-9
*The fertility portion of the tester measures the soil's nitrogen, phosphorous and potash (NPK) content, in combination. Fertility is within the range of too little, ideal and too much, with probe 85mm.