Must have device for climbers

I used the app and device while climbing to Everest Basecamp.
This was such a big help. I used it to figure out my oxygen levels and wether I need to slow down, change the way I breath, need a rest, etc.
It was a great tool to use in order to learn my optimal climbing speed as well as how to breath correctly.
Although the app itself can improve, the device is very easy to use and give quick results.

Shahar Nechmad about Masimo Personal Health