I'm sure they do, but you might just be better off buying a seconds timer and set it to go off for 15-30 seconds a few times a day. Probably much easier and less expensive than a humidistat.
You could also put a regular humidifier in the room to see if that helps. I think there are a lot more options before getting an automated humidifier. Not sure what kind of enclosure you are using but have you considered tubs?
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