Personally I can’t imagine worrying enough about my blood oxygen level to constantly monitor it. It’s a novelty to me, at least as long as I’m reasonably healthy.
Can you hold your breath and watch the percentage drop in realtime? That would be fun. Maybe watch it on an airplane trip to see if the old conspiracy theories about airliners reducing the O2 levels in the cabin to make passengers sleepy and docile has any merit. Maybe eyeball it from time to time if I’m visiting Cusco or some other city at high altitude? It’s a toy to me.
