Quote Originally Posted by mrshawt View Post
The 500r has two plugs to control two different heating devices but will control them to the same temp. The wattage might be 500W but I'm not sure. Look at ZooMed's website and they have the product manual.
You can plug in a strip outlet and it can control more than that, just so long as they are all identical and you don't exceed the total wattage that the t-stat can handle.

As for the OP, for a few bucks more you can get a Johnson or Ranco t-stat. They also show up used sometimes in the classifieds for not much $$.