That could depend. I imagine you are testing with substrate or what ever you are planning to have in the tub when you have eggs. I wouldn't expect there to be much. We are seeing about 1 to 2 degrees difference between the interior and exterior readings on the Accurite thermometer.
Again, all we are really concerning ourselves with is the temp reading in the egg box using the temp gun, and that the incubator stays very consistent. MasonC2K did some tests with Accurite thermometers and found some variances from one to the next. So what I am doing is comparing the reading with the temp gun to the reading on my thermometer. Even if they are not the same, as long as the stay the same difference apart each time, then I can gauge the inside temps accordlngly.
So imagine you take a temp with the gun it says 89 and at the same time the Accurite reads 90. The next time you check the temp gun reads 92 and the Accurite says 93. Thats consistently a degree difference in the same direction. So you could assume that if you want to keep the inside of the box around 88 then you would set your temps so that the Accurite reads 89, but then check it with the temp gun. Always trust the temp gun.
I hope that answers your question and makes sense too.
EDIT: Sorry by the time I posted I just read that you don't have a temp gun. You can get one at Home Depot or Lowes. It is worth the money for absolute piece of mind.
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