You could buy yourself an oxymeter, that measures the amount of oxygination in the blood by shining a light through a finger, and seeing how red the blood is.
The Nonin Onyx from Nonin Medical, Inc., in Plymouth, Minnesota. Measures pulse rate and blood oxygenation at around $US400.
This article from Avweb reviews the product, with information like the following:
Quote:
| As we climbed above 14,000 feet, Brent and I donned conserving cannulas and turned on the flow of supplemental oxygen. After leveling at 17,000 feet, we started experimenting with various oxygen flow rates (using a calibrated vernier flowmeter) to determine the impact on oxygen saturation. We found that without supplemental oxygen, O2 sat readings decreased into the mid-70s (extreme impairment), but that saturation could be brought up to a very acceptable level (low 90s, equivalent to a physiological altitude of 6,000 or 8,000 feet) by using an extremely low O2 flow rate (0.5 liter/minute or less). Turning up the flow rate had no significant beneficial effect whatever. |
O2 Requirement 
Linear Mode
