Hopefully someone more knowledgeable can weigh in, but in the meantime I want to sound a note of caution on this: my experience with pulse oximeters is that by the time it drops noticeably below normal, you are already quite sick and walking a mile may not be practical. The point of the pulse ox is more to be able to quantify your symptoms so that you can have a specific threshold for when you should seek emergency treatment. I don’t believe it’s a leading indicator and so it may not be helpful for this situation.
Hopefully someone more knowledgeable can weigh in, but in the meantime I want to sound a note of caution on this: my experience with pulse oximeters is that by the time it drops noticeably below normal, you are already quite sick and walking a mile may not be practical. The point of the pulse ox is more to be able to quantify your symptoms so that you can have a specific threshold for when you should seek emergency treatment. I don’t believe it’s a leading indicator and so it may not be helpful for this situation.