The smartwatch's Blood Oxygen app lets you measure the oxygen level of your blood on-demand. It's been MIA for more than a year thanks to a patent spat, but it's back in action now.

The oxygen sensor is arguably the most important. Every sensor’s readings are based on normal oxygen levels in air. If the oxygen sensor is faulty, all of the other sensor readings become suspect.

As your car ages and accumulates mileage, its O2 sensor readings can drift too far from the ECU’s expected values. When this occurs, it triggers the check engine light and stores an OBD-II code.

Thanks to a U.S. Customs ruling, Apple has found a technical workaround that restores blood oxygen monitoring capabilities to ...

Apple restores blood oxygen monitoring with iOS 18.6.1 and WatchOS 11.6.1 updates. Learn how to enable this vital health ...

A new sensor could soon allow hospital patients' blood oxygen levels to be checked via their breath. The technology is claimed to be more reliable and less painful than existing traditional methods.