For Temp guns, I have the 205 and the 412. The 205 is cumbersome to use given the placement of the read out and the stupid and hard to find disc batteries that it uses. Because of these factors, I purchased the 412 and I love it!! I use it all the time, it is accurate, and it uses normal batteries!! Also, the way you hold it and the temp readout are sensible. I would get the 412 again in a heart beat!!

For temps/hygro, I use the Acurite. The only drag about it is that the unit itself is not waterproof. So, if a snake decides to pee nearby, some of the LED lines wont show up. I find this to be a huge drag and really don't know how to compensate since they are in the tubs as well as the cages (in the cages there is no problems since the cage is so large relative to the tubs!)

I use Helix's and Herpstats and would not use anything else. They are both rock solid and my snake's need rock solid temps!!

Good luck with your quest!!