Ran the 225* test today with 3 personal probes. My favorite smoking temp. I know that 3 probes left, center, right are not technically enough samples but should be reasonably accurate. At 0 offset (factory preset), and after an hour, at set temperature, all the probes were about 12* to 16* hotter, with swings above and below. So I reset the offset to +10, and also changed the square D (in the center) to "average" which is a continuing 15 minute average. After about another hour, the square D was averaging 225* plus or minus 1*. and both sides were mostly in the 217-235* range (up and down). I had just picked +10 as a guess, since the numbers are not exact degrees. Lucky! I'm sure on different days it might vary, today its 88*ambient. Not sure how the adjustment will effect high temps but plan to do a steak tonight on High, with GrillGrates installed and will see how it goes. My 590 was adjusted +7 on Offset as I recall and was always very accurate after. RT says changing the offset is not nec, as they claim that all controls are accurately set at factory. To do that with my pit they would have to have burned some pellets and taken some temps. Hard to do with an unused and unassembled pit. And in fairness, the error was not much. More importantly, the temp swings were much less than on the Memphis BS and less frequent. I think I'm good to go and happy to be here.