iFixit’s Apple Watch teardown reveals it might secretly be able to measure your blood’s oxygen levels

A pedometer isn’t enough for a device to call itself a serious fitness tracker nowadays – a heart rate sensor is essential for giving meaningful measurements during intense activity. Naturally, Apple says the heart rate monitor on its smartwatch is better than the one’s you’ll find in competing devices, but it could actually be more advanced than they’ve hinted so far: it might be able measure your blood’s oxygen levels too. At least, that’s what the folks at iFixit think. When they opened up the smartwatch in one of their teardowns, they noticed something odd: the heart rate sensor wasn’t…

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