(0.01 pH resolution) Water-resistant Low Power Consumption Automatice Switch-off Low-battery Alarm (as long as there is any display, the accuracy is guaranteed) Model: PH-903 PH-903A Measuring Range: 0.00 - 14.00 pH Accuracy:≤+/- 0.02 pH ≤+/-0.10pH Calibration: 2 points Plug: fixed electrode Temp: 5 - 50癈 (ATC) Size: 150 x 22 x 16 mm