Are you looking for a remote type of temp reading on the pit? I've got 2 Maverick's (ET72 and ET732). Comes in handy when you're smoking two different pieces of meat and you have the probe for the pit temp and can monitor remotely.
My recommendation is to get a ET732. Otherwise, you can get a dial type, but you'll have to open the lid to check the temp.
Performer 22 / Copper OTS 22 / WSM 18 / Black OTS 18