So this guy writes a long detailed article on building a nitrox analyzer making note, among other things, "The Nitrox analyzer project serves as yet another example of the versatility of 8-bit microcontrollers and the usefulness of the C language for programming them." Uh, ok...
Then in his introductory paragraphs, he wrote " I only use my analyzer as a redundant check of a dive technician’s analyzer."
I'll tell you - some of the "dive technicians" that I've encountered pumping nitrox, I wouldn't let pump gas in my car, much less the gas that I depend on for life at 200'.
I'd let this article guy pump my tanks any time he wanted, and I bet the O2 percentage would be accurate to .1% or better.