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pH Meter, Dr.meter Upgraded 0.01 Resolution High Accuracy PH Tester with Backlit Two-Color LCD Display and ATC, 0-14pH Measurement Range with Data Hold Function Digital pH Tester Pen-PH838: Amazon.com: Industrial & Scientific
Ph Meter Tester Pen Soil Water Ph Value Detector Monitor 0.00-14.00ph Precision Glass Probe Water Quality Tester - Ph Meters - AliExpress
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Pro1020 Dissolved Oxygen and pH Meter | ysi.com
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