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Digital Water pH Meter, Dr.meter 0.01 Resolution High Accuracy PH Testing Pen with Backlit and Data Hold, 0-14pH Measurement Range Water Quality Tester for Hydroponics, Pool, Aquarium, Brewing: Amazon.com: Industrial & Scientific
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pH Meter Calibration Buffer Solution 4, 7 OR 10 - 500ml - 1 BOTTLE, YO – NISupply
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How to Calibrate a pH Meter | Sciencing
