I have no way to verify that it is accurate, but it does seem to measure changes in room humidity. I did check it against another product that does the same thing and they pretty much agree on the humidity in the room
I use this in my 1st Grade Classroom as part of our science and social studies curriculum. It is fairly easy to operate. It does what I need it to do, although it can be a little tricky when the outside sensor needs new batteries.
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