Product review (5 stars): Works as expected.
I stuck this bad boy in our whole-house humidifier, and now our whole house is humid.  We keep the humidifier in the room where we keep the guinea pigs.  It's a hoot.  Their hair is all kinky and they leave little vapor trails as they tear around their cage.  Unfortunately, one of them is developing athlete's foot, so I'm going to have to get out the Lotrimin ointment and dial back the humidifier.