One of the most important metrics on a Fitbit tracker is the Estimated Oxygen Variation – and now that every tracker is fitted with an SpO2 sensor, everyone can take advantage. Blood oxygen can ...

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.

Researchers have developed a low-cost sensor from carbon nanotubes that can selectively and reliably measure minute quantities of oxygen in gas mixtures under light. The detector could be used in ...

The new Apple Watch Series 6 has a sensor that measures the level of oxygen in your blood. Photograph: Apple All products featured on WIRED are independently selected by our editors.

Apple has been selling the Apple Watch Series 9 and Apple Watch Ultra 2 without the blood oxygen monitoring feature in the U.S. since mid-January, ...