I don't keep too close of an eye on humidity personally. I use aspen bedding with spigmot moss mixed in. I spray it down a couple times a week and as long as they are shedding well, eating well, and not showing signs of resp - then they are okay. Being where I am in Canada, humidity in the summer is fine without having to do much. In the winter it get's kinda cold and high humidity results in resp infections. So I don't spray unless they are deep in blue. My boas get hit the worst with resp, but I've only had one case of resp with my balls..
But I also use a rack system so it's easy to maintain proper humidity.
As you gain experience with the normal feel and health of your animals you can tell just by handling them whether they are having issues with humidity.
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