There are guys in my brewclub that use them, and plenty of youtube videos of guys using them.
Here's the one my buddy in the brew club has. He's been using it for years for both brewday and his swamp cooler:
http://www.google.com/shopping/prod...=X&ei=r5q3UIS4EJSuqAH5-4D4DA&ved=0CIcBEPMCMAE
Just be careful not to get the cable wet. I've destroyed a few of thermometers by letting the cable get into the mash, only the probe should get wet.
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