I've tried to perform a SpO₂ measurement on my Watch, but a message about BP calibration appeared on the screen. Does the SpO₂ needs to be calibrated?

To be able to correctly start measuring your oxygen saturation level (SpO₂), you need to take a blood pressure calibration before.

When you haven't done the blood pressure calibration, the following message will display on the Watch screen when you try to measure your oxygen level:

"BP calibration...

Please go to the app first to calibrate blood pressure."

It is highly recommended to calibrate your device once a month.