Conductivity Waterproof Pocket Meter, Electric Conductivity Range 0 to 20 mS/cm, ORP Range -1000 to 1000mV, Waterproof Yes, Automatic Temperature Compensation Yes, Operating Temp. Range (F) 32 Degrees to 122 Degrees , Operating Temp. Range (C) 0 Degrees to 50 Degrees , Display Dual Line LCD, Auto Power Off Yes, Calibration 1 or 2 point