i am gonna go ahead and advise you to not buy that thermostat. i have heard many stories about it, from fluctuating temps to it sticking on and leaving the heating element to run full power. not a very reliable thermostat.

go for a ranco or a johnson control. they are quality and can handle alot of power. i have my rack running on a JC. if you have the funds, lot of keepers use helix or herpstats. they are alittle more on the expensive side, but are worth every penny.

try reptilebasics.com Rich is a great guy and will help you out.