Though there were rumors that the Apple Watch Series 10 would get a new heart and ECG sensor, that does not appear to have happened. According to

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It's possible that the Series 10 still has the hardware for blood oxygen monitoring and that the feature is disabled in software. Apple Watch models like the Series 8 and older and newer models sold outside of the United States aren't affected.

Apple announced its first smartwatch. A decade later to the day, the company debuted the Apple Watch Series 10, the latest iteration of the wearable line. In the time between, what users expect from their wrist-worn wearables has radically shifted.