The Apple Watch has been our longstanding Editors’ Choice for its excellent performance, unparalleled app selection, and ample health and fitness tracking features. With the Series 6 (starting at $399), Apple builds upon its flagship smartwatch with the addition of a blood oxygen saturation sensor that calculates your SpO2 level on demand and captures periodic background measurements when you’re sleeping and inactive. Putting this technology in a consumer wearable has never been more important given the global COVID-19 pandemic, as it indicates how well your circulatory and respiratory systems are delivering oxygenated blood to your body, and can help you gauge whether a hospital visit is necessary.
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https://in.pcmag.com/activity-trackers/138122/apple-watch-series-6