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Old 08-06-2015, 06:20 PM   #2
Wharf Rat
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Default Re: Humidity change, help

First, I'd suggest swapping the hygrometers with each other to make sure you see the same problem.

My first guess for the change in RH is that the active cooling in your box causes a change in temperature near the thermoelectric unit. This would, in turn, cause a change of RH. Do you have a little fan in there?
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