Despite the SpO2 / pulse ox being not for medical use, I'm still disappointed in its accuracy. The pulse oximeter on my 245 is consistently out by 7-15%. Pretty much useless, even
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Tutorial – How to turn on the Pulse Ox Sleep Tracking Feature - YouTube
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Garmin vivoactive 4 review: An all-around fantastic GPS watch
Pulse oximeter - incorrect measurements - vivoactive 4 Series - Health & Wellness - Garmin Forums