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Hanna Instruments HI98103 Checker pH Tester with Ph Electrode and Batteries, 0.00 to 14.00 pH, +/-0.2 pH Accuracy, 0.1 pH Resolution: Lab Electrodes: Amazon.com: Industrial & Scientific
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Italian Hanna Portable Ph Meter Hi98103 Pen Ph Meter Acidity Tester Water Quality Detector - Ph Meters - AliExpress
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