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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Automatic Upper Arm Digital Pulse Rate Monitoring Ma K2R6 | eBay
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OxiPro OX2 - N H S Supplied Pulse Oximeter, Blood Oxygen Heart Rate Monitor SpO2 | eBay
Pulse Rate (BPM) Monitor using Arduino & Pulse Sensor
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Heart rate - Wikipedia
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Heartbeat Monitoring System with ADS1115 & Raspberry Pi 4 - The Engineering Projects