Digital pH Meter pH Range 0.00 to 14.00 ORP Range -1000 to 1000mV Waterproof IP57 Automatic Temperature Compensation Yes Operating Temp Range (F) 32 Degrees to 122 Degrees Operating Temp Range (C) 0 Degrees to 50 Degrees Display LCD Auto Power Off Yes Temperature Compensation Range 32 Degrees to 194 Degrees F (0 Degrees to 90 Degrees C) Power Source (4) AAA Batteries Includes 4 AAA Batteries Soaking Solution Buffer Solutions pH 4 and 7 Case