I got my stoker last week and I fired it up with some ribs. I had the probe clipped to the BGE thermometer. The stoker said I was at 225 the egg said I was at 185. So I really didn't know what to do. So I went with the egg temp. Today I did a boiling water test. BGE Thermometer was +35 degrees off.. The Stoker probes were +2, +3, +2. I have been using it about a year now.. I have made some great cooks with it. I guess I need to buy a new thermometer.