Forerunner 245's pulse ox inaccurate? 90% is not normal for someone who doesn't smoke and who's not out of breath. Plus most of the time they struggle to get a reading. What's
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Understanding Pulse Ox | You've heard of Pulse Ox, but what exactly does it do? Pulse oximeter sensors in Garmin watches measure SpO2, the % of oxygenated blood in your... | By
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