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The Red Light for Pulse Ox Reading Disappear

Hi,

I have a vivoactive 4 and I set Pulse Ox reading to all day.

I noticed that since yesterday, my pulse ox reading is not always updated and I check the sensor I can only see the green light (there's a small red light part in the left light in the video).

Is it normal?

my SW version is 6.0.0

0 MB201 over 3 years ago

Looks normal.

The watch recognises when there is nothing in front of the sensors. Also Spo2 only measuring when there is no motion at all.

I've disabled PulseOx. Random results from 75-95%, when my medical Finger Spo2 device shows 95-98%.