this post was submitted on 02 Nov 2023
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Why is my watch making me glow red and why is it so bright (alien.top)
submitted 2 years ago by Deep_inGME@alien.top to c/apple@hardware.watch
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[–] Old_Laugh_2239@alien.top 1 points 2 years ago

It’s measuring your blood oxygen concentration. Red light gets shot into your arm and the light that gets reflected back to the sensors, tells the watch what your O2 concentration is.