Gravity PH Sensor

The sensor isn't restoring the calibrated settings after reset or power loss. The sensor works great after I have calibrated it however having to re-calibrate after every reset isn't working. If I am missing something please let me know. On start up I am only calling the begin routine. Thanks in advance for the help.


Edit: The sensor seems to pull the _neutralVoltage however reading nan for the _acidVoltage on every startup.