Glass Thermometers - A discussion on accuracy.
In my never ending quest to find a thermometer, that is slightly better than sticking my finger in the mash. I ran across this article about "Total Immersion" and "Partial immersion" thermometers.
An understanding of how to use a glass thermometer is critical for accurate readings.
ICL Calibration Laboratories, Inc.
Some helpful information on ASTM and other glass laboratory thermometers
ps: I know what a Thermapen is, Thermapen posts have a tendency to hijack threads.