The Galaxy S20 isn't for everyone — here are 10 reasons you should buy a Galaxy S10 instead
Pulse Oximeter on Samsung phones ( How to measure SPo2 levels and Heart-rate) - YouTube
Lepu Medical Grade Mini Fingertip Pulse Oximeter Blood Oxygen Meter Finger Oxygen Monitor for Kid Child Pediatric Adult Android iPhone Digital Portable Color OLED Oxygen Saturation Monitor PC60NW with Lanyard Wireless Bluetooth
Performance evaluation of a wrist-worn reflectance pulse oximeter during sleep - ScienceDirect
How to Measure SpO2 - Galaxy S8/ S9/ S10 (oxygen saturation) - YouTube