Conductivity Meter TDS Tester Electric Conductivity Range 0 to 19.99 mS/cm TDS Range 0 to 19.99 ppt Waterproof IP65 Automatic Temperature Compensation Yes Displayed Temperature Range 32 Degrees to 122 Degrees F Operating Temp 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