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Old October 15, 2013, 07:10 PM   #6
Senior Member
Join Date: November 28, 2010
Location: Washington state
Posts: 257
You can get cheap humidity gauges by searching the internet. My gauge shows that the humidity in my safe ranges from about 40 to the high 60s throughout the year, depending on the weather outdoors, and whether or not the furnace has been running. Within that humidity range, I have not had any rust problems.
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