Tracking Your Blood Oxygen Level

In simple terms these devices are able to measure the percentage of Oxygen in your blood. This does not seem to be a common function for a Fitness Tracker and seems to have limited value as part of an exercise regime.  

They are readily used by medical practitioners, as a diagnostic tool though to detect if there are any issues in, for example, lung function.  

​If you are interested to check your Oxygen levels, the devices are available quite cheaply from online vendors.

Blood Oxygen and HR sensor (c) Amazon