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3 in 1 PH Meter with TDS/Temp Meter, TDS Water Tester ±0.05 PH High Accuracy with 0-14 PH Measurement Range: Amazon.com: Industrial & Scientific
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TDS-3 2 in 1 TDS/Temp Tester 0-9990 ppm TDS Meter Water Quality Monitor Purity Analyser Automatic Calibration for Pool Aquariums
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