Apple’s new watch has a blood oxygen monitor – what is it good for?

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The blood oxygen sensor on the Apple Series 6 watch uses LEDs and photodiodes

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Apple’s recently released Series 6 smart watch incorporates a new feature: it can measure your blood oxygen levels. The tech must have been years in the making, but the timing of its release worked well given we are in the middle of a global respiratory pandemic.

The amount of oxygen in the blood is important medical information, and in hospitals it is usually measured with a device called a pulse oximeter, which shines a light through the finger or earlobe. Blood carrying more oxygen absorbs …

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