I took the advice from this forum and added another therm. I have one therm. that has a 2 1/2 inch stem at cooking level and added a therm. with a 12 inch stem at cooking level. I was shocked at the 2 readings. The 12 inch stem reads 75 degrees higher than the 21/2 inch therm. Both therm. are working properly. My fire basket is 11 inches in diameter, What therm should I go by? Should I make my basket bigger?
I understand you have a variation in temps from two different thermos. What I do not understand is if these thermos are located on the same cooking level or two different cooking levels. Remember I'm just trying to help and learn at the same time, so this is kinds wordy.
1. If they are on the same level and have been tested for accuracy, then I believe they are both accurately giving you the temp for that particular area of the UDS, Now that being said, I'd say go with the 12 in stem. It is more likely that you will be placing your food more in the center of the UDS than closer to the outer edge.
2. If they are on two different cooking levels and have been tested for accuracy then they probably are a good indication that they are accurate at each of the cooking levels. Makes sense, the closer you are to a fire the warmer the temperature.
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I think that if you want to fix the uneven temps in your UDS, you will need a diffuser. Probably in the shape of your fire basket and located just above the fire basket. I use a 14" Terra cotta saucer lined with foil to keep the grease off, it works like a water pan, but instead of water I went with the sand approach, in this case a clay saucer.
In addition to all this I put my first thermo on the dome lid that I use. Being new this game I thought this would be an accurate indication to the temp of my smoker. It wasn't, it was however accurate for the temperature near the dome and not at the cooking grate level, now I use a 12" stem thermo and put that down through the damper of my lid for my cooking temp.