Title: 2 Stars for shipping only!
Review: I wanted a back-up device for the installed dial unit on my glass-top humidor. By doing the salt test I knew that it was correct. Upon receiving this digital unit I used the same salt test. It registered 17& higher then it should but turning adjustment dial does nothing. Not even the reset button works. Oh, Amazon Prime had it delivered in under two days!! 2 Stars!!
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