Series 10 has the largest display of any Apple Watch to date, even bigger than the first Ultra. With up to 30 percent more screen area than Series 4, 5, and 6, and up to a whopping 75 percent more than Series 3, this is a game-changer for productivity and accessibility.

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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.