I just dial mine to the desired temp, and let 'er rip! Haven't noticed any "play," but it's an analog dial, so there may be. Just have confidence that the units are solid, and the temp will average-out well. Btw, I recommend a Boston butt for pulled pork for the first smoke; it's almost fool-proof, and you'll get a good feel how that baby operates over 12-13 hours.