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HM Digital PH Meter PH-80 Handheld Water Resistant Water Quality Tester Pen with ATC for Hydroponics Gardening Aquariums Reefs Pools Spas Water Treatment Drinking Water: Amazon.com: Industrial & Scientific
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HM Digital PH-80 pH Meter Waterproof PH80 Tester HydroTester: Amazon.com: Industrial & Scientific