Getting Pulse Oximeter Readings
You can manually begin a pulse oximeter reading on your watch at any time. The accuracy of these readings can vary based on your blood flow, the watch placement on your wrist, and your stillness (Tips for Erratic Pulse Oximeter Data).
The watch displays your oxygen saturation as a percentage.
NOTE:
You can turn on and view pulse oximeter sleep data in your
Garmin Connect™ account (Turning On Pulse Oximeter Sleep Tracking).
Parent Topic: Pulse Oximeter