Has anyone had experience with the humidity sensor on the Herpstat 4? Just got one in for my new cage setup and I love it. But I don't know if I trust the humidity reading. I put in completely dry cypress mulch (dried it out to treat with PAM first,) and haven't misted the cages down once yet. Only source of humidity in them are the water bowls, which are not over the UTH's.

When I set everything up two days ago, the initial reading was right around 60 which is why I haven't misted yet. But now it's crept up all the way to 81.

Any thoughts?