Thanks for the reply's. My concern was that the probe hanging in the vent hole was reading 244...245....244...245 and so on. But the WSM was foinf from 250 all the was down to 225? Back and forth slowly. I know they could...or would read different temps but I was worried about the fact that the WSM was fluctuating so much and the polder probe was staying steady? Guess I'll call Weber and see what they tell me. If it needs replaced is there a better temp gauge ouot there to replace it with? Thought I read where someone replaced and did not need to drill? AND...I need to just get the mod for the bolt holes and get a duel probe for grate temp and meat temp.....BUT IM TOOOO TIGHT!