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