I also recommend calibrating the thermometer before a big cook using boiling water. I was part way through mine yesterday and it seemed like my ET-73 was reading high. I grabbed a hand held instant reading thermometer and found it read lower so I used it to determine when to take the bird off. I just checked it and my ET-73 using boiling water and found the ET-73 reading about 213 and the hand held about 187. So I finished the turkey about 20 degrees high! It was still pretty good but might have been netter had I taken it off at the right time.