A simple salt test can help you double check ur humidity levels.
Take your analog hygrometer & put it in a ziplock bag. Take a regular bottle cap, fill 3/4 way with salt, almost to the top but not really. (theres videos if you want to look it up) then put water in the cap, enough for the salt to turn pasty. Use a paper towel to absorb any extra water on top, you only want to see pasty salt. Then put the bottle cap inside the ziplock bag. Zip it up and wait 8-24 hours. The analog hygrometer should read 75%. If theres a dial, you can manually adjust it, although like others have said, I would think that digital is much more accurate.
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