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Digital PH Meter, PH Meter 0.01 PH High Accuracy Water Quality Tester with 0-14 PH Measurement Range for Household Drinking, Pool and Aquarium Water PH Tester Design with ATC: Amazon.com: Industrial &
Amazon.com: CityFarmer PH Pen, Digital pH Meter, PH Meter for Water Hydroponics, with 2 Pack of Calibration Solution Mixture Included : Industrial & Scientific
