Huawei Watch GT 2 can now monitor blood oxygen saturation (SpO2) - Neowin
AMAZFIT Pop 2 with Ultra-large 1.78 inch HD AMOLED Display, BT Calling, SpO2 Smartwatch Price in India - Buy AMAZFIT Pop 2 with Ultra-large 1.78 inch HD AMOLED Display, BT Calling, SpO2
Pulse Oximeter vs SpO2 monitor in Smartwatches: Blood Oxygen Track Reliability, Which One Should You Buy in COVID-19 times, Should you rely on smartwatches to measure blood oxygen,
Commercial smartwatch provides reliable blood oxygen saturation values as compared to a medical-grade pulse oximeter
How to measure your SpO2 on your smartwatch - The Verge