... meter,Pocket-sized pH Meter,Digital pH controller, Digital ORP controller PH meter, digital ph meter, pen type ph meter,mini ph meter ... ,Pocket-sized pH Meter,Digital pH controller, Digital ORP controller PH-618 Pen-Type Automatic Calibration pH-meter (Waterproof) ... is turned on, it will shut down automatically in 4 minutes.Waterproof Grade: IP65Dimensions: 188mm×35mm×35mmWeight: 80g ...