Oximeters are not just meant for people suffering from chronic diseases. This device shows you readings which you can use to gauge your overall fitness. Trekking requires you to have good stamina. This is especially the case for moderate- to difficult-level treks, such as the Himalayan treks. You can assess your fitness quotient and then see if you are healthy enough to undertake a trek at such high altitudes. It is imperative to monitor your health before and during such treks.