I'm a new owner, about 2 weeks, and have been reading a lot on this web site. I decided to test the accuracy of the thermometer that came with the BGE. I boiled a pot of water and put about 1/2 of the stem in the pot, being careful to not touch the metal of the pot. It came up about 10 to 12 degrees F. low. I held the nut on the thermometer with a pair of pliers and twisted the dial to get it back to 100 degrees Celsius and tested it again. Now it is right on 100 degrees C or 212 F. I can't wait to try another Boston Butt.