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PH Meter for Water Hydroponics Digital PH Tester Pen 0.01 High Accuracy Pocket Size with 0-14 PH Measurement Range for Household Drinking, Pool and Aquarium (Blue): Amazon.com: Industrial & Scientific
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PHTK-161 pH TDS Water Quality Tester Replaceable pH Electrode Aquarium Pool Hydroponic Tool - Tekcoplus Ltd.
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