Waterproof pH Tester 30 pH Range -1.00 to 15.00 Waterproof Yes Automatic Temperature Compensation Yes Displayed Temperature Range 32 to 122 Degrees F 0 to 50 Degrees C Operating Temp Range (F) 32 to 122 Degrees Operating Temp Range (C) 0 to 50 Degrees Display Dual Line LCD Auto Power Off Yes Temperature Compensation Range Yes Calibration 1 2 or 3 pt. Includes (4) 1.5 V Batteries Range -10 to 15