Yeah, I bought one from MoreBeer a long time ago that goes through the airlock bung to monitor ferm temps in the center of the carboy. It is nothing more than a ss tube that has one end crimped and poorly welded shut which makes it extremely difficult if not dangerous to get it through the bung. On the other end it has a flared end. The flaring process reduced the diameter of the tube at the flare so I had to use a dremel to grind it out so that I could get the temp probe in it. Over all that Morebeer part sucks, hopefully they have updated it.