Here is the kind I use. I failed to mention that some Eggs will have a hot spot toward the back (by the hinge) It's good to know if yours does, so you can position food or rotate food as needed.An old timers trick for determining evenness of pit temp is to take a large pan and a tube of biscuits (in the case of an Egg a pizza pan would work fine). Get a steady fire going. Spread the biscuits around the pan and put it in the cooker for 8 minutes or so. Take it out and they should give you a good idea of what's happening inside and where it is hotter.~thirdeye~