I built my first UDS I have a concern about temp. I have 2 temp probes in it one in the lid and one in the side of the uds. So I cooked some ribs in it. To double check I put my digital temp probe on the rack though a potato it read 275 the one in the lid read 200 the one on the side read 180 I am confused of why, The ribs come out good and only took 4 hours to cook. After I was done I checked all of the temp gauges in boiling water and all registered between 210 to 215 ??