OK, I've got several hygrometers. One even does double duty, a local and a remote reading jobbie. And I've got one that should do duty in my cigar humidor, except I don't even have one. But the coolest thing about them is that none read the same. So from that I conclude they're not all that accurate.
I've read several articles that suggest the ideal target humidity is between 30% and 40%. Too wet seems to promote corrosion, too dry will harm the wood (cracking or shrinking.) But much worse is the change in temperature. The more, the worse.
So if you're wanting to use a hygrometer, you 'll need a thermometer, too. Preferably one that records. You'll want to see the daily high and low temps along with those humidity readings. You can even buy ones that graph it on a moving strip of paper.
The next thing you've got to do is keep an eye on the gun or guns. Don't know what good it will do, but if you see any rust, clean and oil the gun. It might even be possible we over think these things. Its my best guess.
