Is my humidity gauge broken?

I would recommend getting a new one. But if your spraying for at least 30 seconds, 4 time a day, you should be alright.
 
If you are using an analog dial gauge, then it could be showing you a reading that is not accurate. I would get a digital hygrometer with a probe, they are much more accurate. I got mine on Amazon and it was under 30 bucks.
 
Nice to have two when they are so cheap, if they are reading close to same value you can be reasonably sure it's correct
 
It takes six hours and table salt to double check it's working correctly, and they can fail randomly. I test all of mine monthly and replace as needed. I work with hermit crabs, and I've watched so many people pull their hair out over low humidity when it was just a bad gauge the entire time! Just google "calibrate a hygrometer" and the instructions come right up. It's mostly for people who put a lot of money into expensive cigars and have a humidor, but it works the same on our pet hygrometers. :)
 
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