Blood Oxygen Monitor
If you have an Apple Watch Series 6 or newer, you can also keep track of the oxygen in your blood. While it was met with some initial skepticism after its release, proper medical research studies have shown it to be surprisingly accurate. It can give you a better insight into your overall health, and even help alert you to life-threatening medical problems.
As mentioned, this feature isn’t available on every Apple Watch model — only the Apple Watch Series 6 or newer and the Apple Watch Ultra. Older Apple Watches and the Apple Watch SE don’t have the necessary hardware sensors for blood oxygen tracking.