And I find they work really well.
However, the little temperature dial is useless, given that it goes by color shade. What you really need to operate this thermostat correctly is a digital thermometer, with an indoor/outdoor display and a probe for the outdoors.
I use a garbage tie (or elastic) to connect the probe on the thermometer to the probe on the thermostat. (Connect them just below the probe .. at the end of the wire).
Then, put your probe wherever you are concerned about the temps. The best place, IMHO, for a BP is in his warm hide, or on the warm side somewhere. Now, you can read the thermometer and adjust the thermostat until you get the temp you like.
Once you have this temp, you can remove the thermometer and use it elsewhere.
Spot check the temps periodically, though.
Hope this helps,
Joel
PS: You can, in fact, put the probe anywhere, and just put the probe for the thermometer where you are concerned about the temps. IE: Both probes don't HAVE to be in the same place. The point is that you need a good thermometer to gain full use of the thermostat.
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3.6 Leopard Geckos (1.4 Albino)
~~20 Leo eggs cookin'~~
1.1 Ball Pythons
1.0 African Fat Tail Gecko
0.1 Okeetee Corn Snake
1.0 Blair's Phase Gray Banded Kingsnake