Editor’s note: Due to a patent dispute with medical device maker Masimo, new Apple Watch Series 9, 10, and Ultra 2 units sold in the US no longer have the blood oxygen feature. Older models are unaffected. You can tell if you have a unit with the blood oxygen feature disabled if the part number ends in LW/A.
It used to be easy to pick an Apple Watch. All you had to do was choose whether you wanted the larger model or the smaller one. Then Apple added optional cellular connectivity. Then, a…
