Salute!
Thank you, Luc
My pulse oximeter is super, and according to the literature, FAA likes 92% saturation in daylight and higher at night.
Not hard to keep one charged in the cockpit, and after an emergency descent you can see how well you are doing.
And by the way, in a high workload even as low as 7,000 or 8,000 feet you can get in trouble, especially if you are not in good shape.
Gums sends...