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by NotaMallard » Fri Apr 10, 2009 1:21 pm
Walmart is a great place to start. Go to their outdoor section, they have some 2-in-1 digital humidity gauges and thermometers for $5.
All gauges will need to be calibrated though, for accuracy. Search for "calibrating humidity gauge" if you don't know how.
I've got a zoo in my house. I should charge admission.