IMO, you need to set up the tank to automatically provide humidity. I NEVER mist!!!!! Smaller spaces, Damp moss hides, Large surface area water dishes and LIMITED ventilation and my humidity is just fine. At least I believe so since they are thriving, looking fabulous and shedding in single pieces. I also don't own any type of humidity measuring device or gauge.
I've read on the forums that the auto stuff does vibrate and that may bother your BRB. Also, if you are depending on it, you might become complacent and if it fails, maybe not notice it right away????
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Thanks,
Dave Colling

www.rainbows-r-us-reptiles.com
0.1 Wife (WC and still very fiesty)
0.2 kids (CBB, a big part of our selective breeding program)
LOL, to many snakes to list, last count:
19.29 BRB
13.18 BCI
And those are only the breeders 
lots.lots.lots feeder mice and rats 