Yep, there's a hex-nut on the back. Easy fix.
I have to give credit to you all. I never even thought to check to see if my thermometer is accurate or not. I've been smoking with it now for three years, and always just blindly trusted that it was accurate. I haven't had any serious mishaps, due to temperature, that weren't my fault. (Knock on wood)
Peace, Love, and Vegetable Rights!
Eat Meat and Save the Plants!