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Hanna Instruments HI 9811-5N pH Waterproof Meter with a Water-Resistant, 6000 microSiemens/cm Conductivity and Temperature: Ph Test Strips: Amazon.com: Industrial & Scientific
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Hanna Lab - Learn How to Set Up and Calibrate the Hanna Instruments pH, EC, TDS Combo Tester HI98130 - YouTube
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