I got this same exact one at Wal-Mart for like $12. Works pretty great. I put the main unit on the cool side and extend the prob under the substrate to the warm side. It's nice because you can see both of the temps and humidity.
Oh yea and I also use THIS on a suggestion from LGray for both of my snake enclosures (one is glass tank and other is tub) and they work great.









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