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Gwq-MP160 Online Water Quality Meter pH Sensor ORP Conductivity RS485 Dissolved Oxygen Chlorine Turbidity Sensor 4-20mA, Find Details and Price about Online Water Quality Meter Water Quality Meter pH Sensor from Gwq-MP160 Online Water Quality Meter pH Sensor ORP Conductivity RS485 Dissolved Oxygen Chlorine Turbidity Sensor 4-20mA - Xi'an Gavin Electronic Technology Co., Ltd.