Originally Posted by Full Throttle Q
I use the Nu-Temp and have had great luck with that. There is a special from the Weber board where you can but direct from Nu-Temp for a very good price http://nu-temp.com/tvwb/
Hope this helps,
This is the one I have, 2 units I used one for the grate and one for the meat. It was very nice when I had my old NB offset and very handy when I got my wsm. I haven't used it in a couple of years now. But it was very useful at the time.