PH meter, digital ph meter, pen type ph meter,mini ph meter,Pocket ... Digital ORP controller PH meter, digital ph meter, pen type ph meter,mini ph meter,Pocket-sized pH ... controller, Digital ORP controller PH-618 Pen-Type Automatic Calibration pH-meter (Waterproof)Specifications:Range: pH 0.00-14 ... it will shut down automatically in 4 minutes.Waterproof Grade: IP65Dimensions: 188mm×35mm×35mmWeight: 80g