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