If the unit displays a "Calibration Due" warning message, please check the date shown in the top-left corner of the display and confirm that it is correct.
If the displayed date is incorrect or outside the normal date range, update it to the correct date.
Once updated, remove the battery and leave it out for 10–15 minutes. Then, reinsert the battery and check the date again.
If the date remains incorrect or reverts to a date outside the normal range, please let us know.
This may indicate that the internal backup battery is faulty and the unit may require service.
Please feel free to contact us at support@andatech.com.au