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Oakton pHTestr 10 Waterproof Pocket Tester 35634-10 from Cole-Parmer
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Multi-variable Water Quality Testers | Omega Engineering
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Amazon.com: PH Meter, Digital PH Tester 0.01 High Accuracy PH Meter for Water, 0-14 PH Measurement Range for Drinking Water, Pool and Aquarium : Industrial & Scientific
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PH Meter Tester Kit, Digital PH Meter, 0.01 Resolution: Amazon.com: Industrial & Scientific
