I also, as most here have posted, had noticed that the factory thermometer was not accurate on the Master Forge Dual Door Vertical Smoker. When I first bought mine I gave the thermometer the boiling water test and knew it was way off. I called the 800# in the manual and had them send another one. The first one read WAY too low and the replacement is closer but too high. At the recommendation of a lot of folks I invested in the Maverick 732 digital remote and boy I'm happy I did. Very accurate unit and not stuck outside "babysitting" the smoker. Just set the alarms and it will let you know what's going on. Anyway, here are a couple of pics showing how far off these MF factory door thermometers can be. This was the first one that came with it. Hope this helps.