What do you intend to do if you find it's high?

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I need to monitor the humidity in the crawl space under my house.
Radio Shack has a unit that you mount inside your house and then place
a remote sensor in the crawl space. Has anyone had experience with
this unit? Can anyone recommend a better uni?. I like the idea of
being able to monitor the humidity inside my house without having to
go into the crawl space.