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Will variations in O2 catch covid illness?

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One of the reasons I want to catch slow degradation of o2 saturation. An insidious trend. This device won't provide relevant information for that. The variations are over a few days.  Why is fitbit unwilling to provide o2 saturation as a percentage of ideal? Big bad FDA concerns?  My next device will tell me that. Will it be a fitbit?

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If that concerned with O2 saturation, as an engineer doesn't a $15-20 fingertip pulse-ox meter that shines energy through fingertip gives more accurate readings than reflected energy of any wrist wearable?

Before posting, re-read to see if it would make sense to someone else not looking at your Fitbit or phone.

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