Plug the FieldLab Pressure into the computer with the provided USB cord, power it on and open FieldLab Desktop software.
Select the FieldLab device you wish to change.
Go to the Overview Tab and select Re-calibrate FieldLab.
Select Reset Calibration Date
Revise the Next Calibration Due date as desired and Save.
You can always view the next calibration date from the Overview Tab in FieldLab Desktop, and from the Information Screen on the FieldLab.