As the the title suggests, how is it that a little light they put on our finger when at the doctors/hospital/etc.. is able to tell us our blood oxygen levels?
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Since this has already been answered. I wanted to point out, some smartphones phones can do this now too. I’m using Galaxy S9 and it has this ability. Just found out when I got Covid a few months ago. Compared it to a hospital “finger light thing” and it was accurate.
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