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Just curious as to which probe you would think is the most accurate for the overall temp of the smoker - the one closest to the stack (mid-grate level), or the one just past halfway toward the firebox?
Heat zones are unique to each different style of smoker. All my smokers are round, so I like to monitor the grate temp in one spot, then spin the grate a couple of times to balance out heat.
Maybe you could use the biscuit test or several oven thermometers to locate your hot spots?
The Thermopro model I have has 4 probes. I have had all four probes on the grate and it consistently gets warmer the closer you get to the stack. Right now I have a 40-degree difference, with the stack end being higher. Is it a wash? Is one temp closer to the actual temp affecting the meat?
Well at least you generally know where the variance in grate temps is, and if you only wanted to use one pit probe you could estimate temps in other spots.