Why are the measured values of blood oxygen on the Xiaomi Smart Band 10 too low?

If the measured values of blood oxygen are too low on the Xiaomi Smart Band 10, please refer to the following details:
1. Please check if the band is not worn in the correct position. Since there are fewer blood vessels in the wrist, the blood oxygen value is not easy to be measured. Please wear the band at a distance of one finger from the wrist bone (ulnar protrusion);
2. Please check if the band is worn too loosely. Please wear the band tightly, with a slight sense of tightness, and the band will not move when shaking the wrist;
3. Stretch your forearm and open your elbow joint to avoid squeezing the blood vessels, which will cause blood to flow poorly and make the measurement value inaccurate;
4. Put your arm on a stable place such as a desktop for measurement, with the band screen facing up, to avoid shaking and unstable signals;
5. It is recommended that you move the band wearing position, ensure that the back of the band fits the wrist and keep it still before measuring again;
6. The latest version has been optimized accordingly, please upgrade to the latest version for further experience.