Range pH 0 to 14.00, mV 0 to ± 1999. Touch Button Calibration. Display 3.5 Digit LED. Resolution pH 0.01, mV 1. Accuracy pH ± 0.01, mV ± 1 mV. Temp. Compensation Auto 0 to 100 deg. C., Manual 0 to 100 deg. C. Slope Control 80 to 120%. Power Supply 230V ± 10P Hz AC