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Apple Watch Blood Oxygen Sensor Returns: How to Use It and What It Can Tell You About Your Health The smartwatch's Blood Oxygen app lets you measure the oxygen level of your blood on-demand. It's ...

The condemned man is challenging the use of nitrogen hypoxia gas as unconstitutionally cruel. He suggested a firing squad, hanging or medical aid-in-dying as better alternatives. A federal judge ...

To set up the Blood Oxygen sensor, open the Watch app on your iPhone and tap the setting for Blood Oxygen. Turn on the switch for Blood Oxygen Recordings, if it’s not already on.