Has anyone tried using reptile thermometers/hygrometers? Went to walmart last night but was not impressed with their selection. In particular, I'm looking at the ones on this page, as they are somewhat local to us. http://www.reptiledepot.com/thermometers.html and http://www.reptiledepot.com/digital.html Thanks! Most of my 'google-fu' is coming up with places to buy them, not actual reviews.