crholliday,
Those 2 TP that you provided links for look very nice. They are currently at the top of my list. I like the strictly USB model but I would probably opt for the hand held unit, so I wouldn't have to have my laptop present when roasting.
I was listening to a CoffeeGeek podcast last night and Mark Prince mentioned the Fluke 52 series. I got a bit of sticker shock when I Googled the Fluke meters.