A pulse oximeter is a small monitor that can help to identify altitude sickness. However, it is rather a “nice to have” than a “must have” because they are not always fully reliable.
It’s more important to have a well-trained guide who can watch out for safety symptoms and knows how to interpret results of the pulse oximeter well, rather than blindly relying on them.
In any case, without a knowledgeable guide, the device will not help much. Therefore, ask your operator about whether they provide oximeters and the level of training they give to their guides on how to use them.
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