I use the pdt650 uei pocket thermometers. Bought two on special at John stone about two weeks ago.
I tend to go through these thermometers like crazy, I always forget and leave them stuck in plenums and stuff.

 

R E Michel has the 650s cheap. We're all as bad as chevster at losing them. Most put their initials on them so the next guy finds it and returns it.

 

I don't lose many but I sure break my share. I had 2 Fieldpiece folding ones and neither made it through the first battery, the display died. The Coopers I had, had the swivel heads and I can't keep the display from separating from the head. I don't know I cant seem to find the ones like I used when they first came out, I would go through several sets of batteries before I killed them. Can't seem to do that anymore.

 

The Flash Check 11061 is accurate, fast, and VERY durable. waterproof and such. But nothing fancy like magnets. Currently using UEI PDT650, the magnet and swivel probe are nice.

 

I picked up a cooper atkins dpp400w. It is water proof, has a reduced tip that fits in geo water ports, and has a lifetime warrenty. I believe I paid $30 w/shipping and is 1000% better than the hvac models at the supply house.

 

I have sme Coopers and like them, I will have to check into that one.

 

Testo 104.......going on two years and not an issue. Rugged, accurate, water-proof, and very very happy with it.