$20 to spend on UTH and dimmer, would it be enough?

[mrshawt]

So is it just a trial an error thing until you get the right temp?

Will all of those reptitherms have the same range on the dial or does it vary from one to another. What I mean is if one is set at 90 degrees will another be 90 in the exact same spot?

Yes, but you have to do that for any tstat really, as the temp at the probe may not always equal the temp on the substrate.

The second question depends if the tstats are in the exact same conditions. In theory, they are all manufactured the same and should be the same to work, but sometimes some units are different.