Product review (2 stars): Wildly wrong readings
This hygrometer is useless.  The product description says it is "highly accurate," but in fact it is wildly wrong.  I checked it against another hygrometer and also did the salt test.  It badly flunked both.

Update:  I have bumped my rating up a star for good customer service.  Many reviewers say their units are accurate.  Others, like me, got one that isn't.  However, i-Tronics gave me a prompt refund without the hassle of returning the defective unit.