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2 Pack pH Meter and TDS Meter, 0.05 pH High Accuracy Tester Pen, ± 2% Readout Accuracy Digital Water Quality Filter Pen, 0-9990ppm, Ideal Water Purity Test for Drinking Water, Aquariums, Hydroponics:
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PH Meter with ATC Food PH Tester, Waterproof Digital Food PH Meter with High Accuracy PH/Temperature Probe - Walmart.com
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7 in 1 Water Quality Tester Pen Meter for Pools, Drinking Water Aquariums Hydroponic Cooking Tester Digital LCD PH/TD/EC/ORP/TEMP/SG/Salinity Water Quality Tester Meter Pen - Walmart.com
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