I was just surfing the Smoke Ring site and saw a review of a new dual sensor thermo from Polder. Looks like an ideal unit for the WSM. Here is the link to the review. I'd be interested to know if anyone has used it or seen it in use.
http://www.thesmokering.com/tools/polder/default.jsp
JC
http://www.thesmokering.com/tools/polder/default.jsp
JC