There are a lot of ways to measure temp. Look in the Operating Tips & Mods section of this site. Personally, I think the wireless therms are a waste of money in that I bought one, used it for a while and now I don't any more. It was a fun toy for awhile but now I just rely on my thermometer that I have mounted through the rivet on the top vent. Simple but effective. After you've used your WSM for awhile, you'll know how it works and how to keep temps stable. Once mine is stable, I don't have any concerns about going to sleep at night on my overnighters. If money's an object, I'd pass on the wireless. If you have some extra money, it wasn't a bad toy. In my opinion, mount a thermometer and get a Thermapen. That's all you need.