I've done this before (in the old days). Be forewarned, this is for 75% humidity. So if yours is lower, then adjust accordingly. If you have a scientific model that has a high degree of accuracy, then this isn't necessary.
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Ross
http://orchids-ross.blogspot.com/
I don't do most Dendros or large, "floofy orchids". For me it's minis (like Angraecoides), Masdies, Paphs, and others that crept in somewhere along the line. See my orchid list for complete collection (usually not current.)
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Calibrating a hygrometer (used ofr measuing humidity)
Linear Mode
