BATTERY REPLACEMENT SPECIFICATIONS • Replace all 4 LR44 batteries when the low battery icon is flashing, or when troubleshooting (below) fails. • Unscrew the cover and install the batteries with the flat positive (+) side of the batteries facing the spring. • Do not remove the O-ring. • Remove the batteries when the unit is not in use for an extended period. pH Range pH Resolution 850051 850052 Accuracy 850051 850052 Adjustable Calibration Points Temp. Range Operating Environ.