I have two thermometers; a cheap walmart one and a Oregon Scientific AW131. Both have been checked using the ice method and boiling water and both read correct. The problem comes when I insert the Oregon one into a potato and get reading in my smoker 40 degrees higher than the walmart one and oven thermometers as well. I will place the cheap walmart and oven in the same spot and get reading of 225 but when the Oregon is placed it will read 265. Whats curious is that sometimes in will read correctly after about 4 hours. Would the potato be throwing the readings off? Any and all advice would be greatly appreciated.