Nonin’s FlightStat is easier to use and read, but it costs $100 more and we were put off by the company’s high repair costs.

Both oximeters delivered similar data.

If the Boy Scout manual included an aviation edition, pulse oximeters would surely be on the required list of field equipment. They’re a terrific idea, but above a certain price, they’re a gadget most of us will do without. Based on Nonin’s success with its clever FlightStat, we would guess that price barrier to be about $300, a price point that appears to have sustained a market for at least four years. (Nonin has outlasted other products in the niche aviation market.) …