iFixit’s teardown of the Apple Watch has revealed that the sophisticated heart-rate monitor used is actually capable of acting as a pulse oximeter, allowing it to calculate the oxygen content of your blood by measuring how much infrared light is absorbed. This data would be useful for health and fitness monitoring, but the functionality is not currently enabled in the watch.

As iFixit notes, there are a couple of possible reasons Apple is not currently allowing to watch to display this data …  expand full story