Another classic thermapen owner here. It's great, but the display is on the wrong side for lefties. I actually use it for cooking. And for checking the temp of my FG sample.
For my money though, if you're looking for a brew-day thermometer, get their ChefAlarm. You can set alarms when the probe reads high and low temps. Say, 165, and 65.
I stick it in my strike water, and it beeps when it reaches the right temp to start mashing. After the boil, I sanitize the probe and stick it in the kettle with my immersion chiller. It beeps again when I get pitching temp.
Sorrry to sound like a commercial..