DCRainmaker is pretty good at comparing the various sensors on different sports watches. This is for the series 6 Apple watch: https://www.dcrainmaker.com/2020

DCRainmaker is pretty good at comparing the various sensors on different sports watches. This is for the series 6 Apple watch: https://www.dcrainmaker.com/2020/09/apple-watch-series-6-first-run-accuracy-spo2-sensor-data.html https://www.dcrainmaker.com/2020/09/apple-watch-series-6-fir...