PH Meter Digital Water Tester, 0.01High Accuracy Water Quality Tester Pen with 0-14 PH Measurement Range for Drinking Water, Plant, Swimming Pool: Amazon.com: Industrial & Scientific
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1 Pack PH Meter Digital PH Tester 0.01 High Accuracy PH Meter for Water, 0-14.0 PH Measurement Range, PH Meter with ATC for Drinking Water, Food, Brewing, Pool and Aquarium - Walmart.com
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