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IMPROVED DESIGN.WATER-RESISTANT. w/ molded eye allows installation above sample to be monitored. removable electrode & probe. HIGHLY ACCURATE. can be

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VIVOSUN PH Meter Digital PH Tester Pen 0.01 High Accuracy Water Quality Tester with 0-14 PH Measurement Range for Hydroponics, Household Drinking, Pool and AQ

Digital 7 In 1 Fast Reading PH Meter Aquarium Pool Water Quality Tester Monitor

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PHTK-153RE Digital pH Meter Water Quality Tester Monitor w/ Replaceable BNC Electrode Aquarium Tank - Tekcoplus Ltd.

Wholesale Digital TDS EC PH Meter Set 0 00 14 00 Water Quality Purity Monitor Test Pen LED Display Temperature Tester For Aquarium Pool Mete281t From Yani3, $29.31