You can test your humidity gauge by taking a 2 liter bottle top and filling it with salt, then add enough water to it to just get the salt wet without any standing water.
Seal the cap and unit in a ziploc and set it down somewhere inside out of the sun and leave it for a day or two.
Should read 75%
Ive found that the Acurite brand ones I pick up sometimes are pretty accurate.
Also try using a smaller water bowl, newspaper, and more ventilation holes if you struggle with too much humidity.
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