Hello neighbor! When I ordered my WSM, I also ordered a Redi-Chek ET-73. I had about a 50 deg. difference in temps. The Redi-Check was measuring grill temp as opposed to the factory gauge reading lid temp. I checked the Redi-Check for calibration (boiling water) and it was pretty close. I've read that the lid temps can be somewhat higher than grill temps??? Bottom line is, I'm depending on the Redi-Check to give me accurate readings. Thanks for the heads-up.Hey there, i am from chandler too. I also have the WSM 22.5" bullet smoker. Great smoker! Make sure to double check your factory temp gauge on that thing, mine was WAY off. Good luck ! And post some pics up when u get to smoking!