Great work, good find.
So, I calibrated a NTC probe:
-- AVX Type NI24 --
with a 463 ohm resistor, in a voltage divider arrangement.
From 35 Degrees F to 190 Degrees F.
I can say with 95% confidence that the following curve fit equation is accurate to +/- 1 degree from 35 degrees to 190. In some cases it is better than .3 degrees F accurate.
N = -1.4618 * N ^ 6 + 21.062 * N ^ 5 - 127.38 * N ^ 4 + 409.96 * N ^ 3 - 731.9 * N ^ 2 + 626.52 * N + 10.658
Where N is the phidgets sensor raw value.
I've incorporated this logic into the latest revision of the RR source code.
PM me if you need some of the thermisters, they're more accurate and cheaper than the phidgets variety.
Compare to Phidgets, which has an accuracy of +/- 4 degrees F, and are mounted on a board....these thermisters can be epoxied to anything.
care to share the code ? If I can merge it the main sources, you won't have to add it when new releases come in. Just email it to me (my email is on my public profile).