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Home pulse oximeters can help diagnose covid-19 symptoms, but it's easy to use it the wrong way - The Washington Post
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Amazon.com: CONTEC LED CMS50M Pulse Oximeter,SpO2 and PR Value Waveform Blood Oxygen, Neck/Wrist Cord : Health & Household
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2021CE CONTEC CMS50N CMS50M Pulse Oximeter Fingertip blood oxygen saturation, SpO2,PR monitor,OLED - AliExpress
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