I have never seen the CDN digital thermometer mentioned on the forum, but this is what I use
. Price is right, 3 AAA batteries last forever (1-1/2 years and running), and the armored cable handles the heat in the grill. I recommend it. I also have a Thermapen but am not that crazy about it, mainly use an Extech probe thermometer for spot measurements.
XLBGE, Small BGE, Homebrew and Guitars