Product review (3 stars): hygrometer likely inaccurate
I compared this hygrometer with four AcuRites for several days in a closed room, and this hygrometer always read 10% higher. I put it outside and it went to 61% in short order, but back in the room and it never read less than ~54%. (All five thermometers agreed to within one degree.) Altho' I don't know which is the most accurate, I suspect this one isn't. I'll give it another couple of weeks (we're having a warm winter) and modify this review if warranted.