I have the Zoo Med t-stat r-500 or something like that and I did not trust it. I had it stuck to the wall and it would fall over on it's side and I would stand it back up. I had the probe on the hot side of the setup and the t-stat set to 94 and there were time's I would go in the room and it would be at 113 degree's. I would then freak out for a minute. I had it set to 94 at the tub temp would sometimes be 86 to 101. crazy.....Maybe I just had a bad one, but if I had to do it again I would spend the money and get something better.

Richard