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Blood Oxygen monitoring returns to the Apple Watch after US ban - see which models get it

Thanks to new OS updates rolling out now, you can once again use your Apple Watch to measure the oxygen level in your blood.

Instead of measuring and calculating your blood oxygen levels directly on the watch, the monitor will handle all the work through a paired iPhone. The two companies had met years ago to discuss a possible collaboration, but Masimo has alleged that the meeting was just a pretext for Apple to learn about the Blood Oxygen feature and poach some of its staff. Since the Blood Oxygen feature had been disabled without any hardware changes, bringing it back requires just a couple of quick software updates.

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