I'm not the first here to mention it, but I love my Thermoworks "Signals" 4 channel system. It comes with a chamber prob and 3 meat probes, but if you trust your cooker you can easily swap that for a fourth meat probe. I didn't realize until I started using this how sometimes things didn't go a planned. Signals monitors and records, so if you think you're stalled, just pull up the graph to see for how long. My SM066 got blown over in a wind storm about 3 years ago and the door doesn't seal as well as it should. Now I know but moving the chamber probe around I know by how much i need to adjust. They go on sale from time to time, of when you first log in you'll be offered a discount. Check 'em out. (I'm not an employee or an investor.) Copy and paste for their site.
Hint: If you know you'll be using it, charge it up ahead of time as it is rechargeable, and I sometimes forget to charge it after use.
RonW - Aurora CO