https://www.amazon.com/gp/product/B014DAVHSQ/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1 I purchased it in 2016
I have this ThermoPro setup and have had a good experience: ThermoPro TP08S Wireless Digital... https://www.amazon.com/dp/B014DAVHSQ?ref=ppx_pop_mob_ap_share
I have the Weber Smokey Mountain and it has a small rubber piece built in to run the probe through but I still just run it under the lid and it’s been fine.
Smoker: Camp Chef Smoke Vault
Thermometer: ThermoPro TP-08
I kept water in the pan throughout the cooking. I have a dual probe thermometer so I had one in the thick, meaty part of the butt (not touching bone) and the other on the same rack as the butt but 5-6 inches away.
I had the butt positioned on the second highest rack. The recipe I followed didn't specify where it should be placed, but maybe that was an factor for the long smoke time?