This one?

http://www.joshsfrogs.com/exo-terra-...ygrometer.html

I don't have it personally but it's probably a decent piece of equipment. Thing is for that price I think you are paying mostly for the "exo terra" name. You can get almost the same thing much cheaper. Such as this.

http://www.ebay.com/itm/DIGITAL-LCD-...item35c9e86eff

Or even the accurite from Wal-Mart. Hope that helps some.