No, unfortunately they are P.O.S.'s.

If you're looking for a cheap but reliable tstat, look up "ZooMed Repti temp 500r." Much better for a small price of $30 or so at most websites.

Or...if you're looking for a higher price range, check out the Ranco or Johnson tstats here.

Or better yet are the Herpstat and Helix.

But I use a 500r and recommend it. Just make sure it has a backup, like a $10 Lutron 300W lamp dimmer in case it fails (true of any tstat regardless of price).