Title: Garmin Fenix 5X Plus review
Headings: Garmin Fenix 5X Plus review
Garmin Fenix 5X Plus review
Garmin Fenix 5X Plus: Design
Garmin Fenix 5X Plus: Sports tracking and mapping features
What is pulse ox acclimation?
Garmin Fenix 5X Plus: Smartwatch features
Garmin Fenix 5X Plus: Battery life
Garmin Fenix 5X Plus

Content: Overall we've found the sleep tracking to be more accurate, which is great, but chances are you're not going to want to wear a watch this size to bed…
What is pulse ox acclimation? The big new feature on the Garmin 5X Plus, not found on the other Plus watches, is what Garmin refers to as "pulse ox acclimation". Put simply, Garmin is using a pulse oximeter to take a measurement of your blood oxygen saturation (how much haemoglobin is carrying oxygen). If you've seen us talking about SpO2 before, it's the same thing. Measuring blood oxygen saturation can reveal many helpful insights, but while Fitbit is interested in using it for conditions like sleep apnea, Garmin has put it in the Fenix 5X Plus so you can keep an eye your saturation when scaling higher altitudes. This is what the new red light on the back of the 5X Plus is checking for. Your saturation will be displayed as a percentage; the higher the number shown on the screen, the better. Most people need this saturation level to be at least 89% to stay healthy, and at sea level the human body operates to its best potential. But at higher altitudes the amount of oxygen in the air decreases, which can have an effect on someone's SpO2.