7. Press [+]. A countdown screen is shown as the calibration is
performed:
Note: You may abort the calibration during the countdown by
pressing [-]. If you stop the calibration, the process stops and
this screen is displayed before the menu screen is shown:
8. Once the calibration is complete, this screen is shown:
9. If the calibration is not successful, and you see the “Zero
Calibration Failed” message, check that the inlet is not
blocked and that there are no other problems before retrying.