I bought this one in 2018. It works and I haven't had a problem with it yet. There may be others but at the time I felt it was best on amazon for the price. It comes with 4 probes with room for 6. The app is decent. Takes some practice to use it but I've found it useful and let me know when my old smoker blew out. I ran it for 8 hours on Wed smoking some meat sticks. Its bluetooth is better than the masterbuilt smoker Bluetooth that kept cutting out.
https://www.amazon.com/gp/product/B077TF4TGH/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1 it was cheaper when I bought it.
If you want to check out the app it is Smart BBQ meter on googleplay