It’s not often that upgrading to the latest model of an Apple product means sacrificing a key feature, but that is the case for anyone in the USA upgrading to the Apple Watch Series 10 from the S6 or later.
The reason is that, if you bought a Series 6, 7, 8, or 9 (before January 18), then it includes a blood oxygen measurement feature; if you buy the Series 10 or Ultra 2, you’ll lose that …
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