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PH Sensor for Arduino, PH0-14 Value Detect Sensor Module + PH Electrode Probe BNC, PH Sensor UNO, PH Sensor Arduino Kit, PH Sensor Raspberry Pi Kit, by HQ&LP: Amazon.com: Industrial & Scientific
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Analog pH Meter Pro V2 Professional pH Sensor Compatible with Arduino and Raspberry Pi: Amazon.com: Industrial & Scientific
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