Understandable....I'm a veterinary student finishing my undergraduate pre-vet degree at Ohio Wesleyan, it's very unusual that the vet from A&M wouldn't suggesting using a humidity monitor. My specialization is herps and I'm getting a separate degree for herp medicine, and one of the very first things I was taught was to always have a heat and humidity monitor in herp tanks to ensure their conditions are optimal. I find it really odd that he would have disagreed.
Anyhow, looks like everyone gave you some great information. Good luck! :D