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This app claims to let users monitor SpO2 levels and pulse rate with your smartphone: Here's how it works | Tech News
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Wellue Bluetooth Wireless Fingertip Pulse Oximeter. iOS & Android APP. SpO2 & Pulse Rate. FDA Approved.
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Pulse Oximetry: The Redness of Blood in Patient Monitoring, Health Screening, and Sports Physiology | SciTech Connect
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