pH/TDS/Temp - Monitor: Range: 0.0 - 12.0 pH, TDS 0-1990 ppm, Temp. -10 60.0 Degrees C / -14.0 - 140 Degrees F, Resolution: 0.1 pH, 10 ppm, 0.1 Degrees C / 0.1 Degrees F, Accuracy: +/- 0.2 pH, TDS: 2% Full Scale, TDS Factor: 0.5 or 0.7 Switch, Calibration: