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Old 01-25-2014, 05:46 PM   #26
mikesr1963
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Default Re: How to Calibrate a Hygrometer?

I'm doing my second hygrometer using the salt test. This one just, as the other was at 75% within an hour. The dial hasn't moved in 3 hours. On the other, I waited 24 hours and the dial was solid the entire time. Other sites I've read recommend 12 hour wait. So far, I haven't seen the need to wait that long. Each time the meter started at an RH in 30's.
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