With the Fenix 6x Pro, non-sapphire, it's spot on, about all of the time. I have a finger pulse ox I use to use, but now after testing this one very often and looking at the history, I don't need my finger one anymore. This is within 1 to 2% of a dedicated pulse ox. I'm actually very impressed. I wear it on my left wrist, snug, not tight.
Garmin Epix 2 review: Price and availability with a slate steel body, costs $899. A model with a sapphire crystal lens, titanium case, and 32GB of storage (available in white or black) willUnboxing, Setup, Menu & Interface Tour, Data Pages, Maps, and more with the Garmin fēnix 6 Sapphire.Garmin fēnix 6, 6S, 6 Pro, 6X Pro, 6X Pro Solar ComparisoFinally bit the bullet and bought this model, larger style - 51mm body, but under 100g and so not noticeably heavy on the wrist. Great set of features for day-to-day life. Sleep monitoring, step count, pulse ox. Hugely customisable within each category. Simple to set up and pair with Android phone, syncing is seemless. LwyksMw.