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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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Amazon.com: Garmin vivoactive 4S, Smaller-Sized GPS Smartwatch, Features Music, Body Energy Monitoring, Animated Workouts, Pulse Ox Sensors and More, Silver with Gray Band (Renewed) : Electronics
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