How do I measure blood oxygen saturation?

Open the Blood Oxygen Saturation app, and start the blood oxygen saturation measurement as instructed.

Precautions:
1) Wear the watch one finger away from the wrist bone (protrusion of the ulna).
2) Wear the watch tightly, with an appropriate sense of pressure.
3) Place your arm on a tabletop or a stationary surface, with the watch screen facing up.
4) Remain still during the measurement process and focus on the measurement.
5) Factors such as hair, tattoos, shaking, low temperature, and incorrect wearing of the watch may affect measurement results and even lead to measurement failure.
6) The measurement range of this watch is 80%-100%. This feature is for reference only and should not be used as a basis for medical diagnosis. If you feel unwell, please seek medical advice.