No.

The calibration factor is already stored in the monitor's memory and applied there, while the mobile App only retrieves the measurement data from your Pro. This means your measurements do not need to be recalculated.

You never have to apply the calibration factor, as your Pro does it for you.

When you get back your Corentium Pro after the annual calibration, there is no need for you to calculate the calibration factor as it is done for you automatically.