I agree with Grif here.

I used an Exo-Terra RS400 misting system. It worked as it should but cause too many issues with getting the substrate too wet. You pretty much need a false bottom when using a misting system to provide drainage and keep the substrate from becoming overly saturated.

I would recommend using the Zoo Med Repti fogger that Grif suggested hooked up to a Zoo Med Hygrotherm. The Hygrotherm regulates heat and humidity. Just plug your heat and humidity sources into the Hygrotherm, program the desired temperatures and humidity percentages, and it controls it all for you.

It has worked very good for my setup and makes everything almost 100% automated. The downside is costs as both the Repti fogger and hygrotherm together will run you about $130 or so (at amazon.com).