99 mS/cm.Range (F) 32 Degrees to 122 Degrees F, Operating Temp. Range (C) 0 Degrees to 50 Degrees C, Display Dual LCD, Auto Power Off Yes, Temperature Compensation Range 0 Degrees to 50 Degrees , Calibration 1 point, Power Source 4 LR44 Batteries Conductivity Meter,DS,0 to 19.