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Well, I can't recall off hand. There is a chart, but it depends on the temp. I thinks it's 75%Rh at 70¼F, not sure on that it's been a while. I bought an Accurite brand digital hygrometer and it was right on the money when I tested it. It now reads 65-68%Rh at 67-70¼F, which is perfect IMHO.
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