Product review (3 stars): Never read the same
I probably should have read more of the reviews, even after several weeks of having both units sitting about 3 inches apart, in a place with no drafts in my workshop they have never, ever read the same readings. They're always about a half a degree or a bit more off and around 4% different in humidity. Not entirely sure about their accuracy. I wanted them for candy making so I needed really good accuracy. I've been splitting the difference and hoping that's about right.