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Apple Watch 6's blood oxygen sensor is unreliable and misleading - The Washington Post
Coronavirus pandemic: GOQii launches smartwatch with pulse oximeter at Rs 5,999 - BusinessToday
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,
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Apple Watch Series 6: SpO2 tracking is still in its early stages - CNET