Model :PH-890 PH-990 Measuring Range:0.00 - 14.00 pH 0 - +/-199.9 mV 0 - +/-1999 mV 0~100 癈 ,0.00 - 14.00 pH 0 - +/-1999 mV 0 - 2x10000uS/cm 0~100 癈 Resolution: 0.01 pH 1 mV 0.1 癈 , 0.01 pH 1 mV 0.1 癈0.1 1 10 100 uS/cm Accuracy: +/-0.01 pH +/- 0.1% FS +/-1% FS +/- 0.01 pH +/- 0.1% FS +/-1% FS +/-0.5 癈 Calibration: 2 points (4.01 pH, 6.86 pH or 9.18 pH) Temp: 0 - 100 癈 (ATC)