I have a Thermoworks pocket thermometer. Digital display. 6 sec response advertised, but is quicker. Does same things as the thermopen, but costs $19. I also bought one of their IR-GUN-S laser infrared thermometers. On sale now for $49. This thing has a lot of uses besides checking the interior temps of your grill.
Green Mountain Grill Daniel Boone. A stove in the house.