Product review (5 stars): Exact Replacement
Works great. When I had my central air/heat installed, they initially installed an "intelligent" humidistat. It was supposed to learn things. Mine was retarded. I had this manual unit installed and it worked great. I like being able to hear the click of the switch when I adjust it. And if the windows start to sweat, I can turn it down for immediate results.
WARNING: If you install an ultraviolet sanitizing light in the same duct (nearby), it destroys the membrane in this unit. Trust me. I didn't buy this replacement for no reason.