Humidity isn't something I worry too much about in all honesty. ..
Mine all get sprayed fairly regularly and increase the spraying to a few times daily when they're in shed mode - all shed perfectly .
Oddly enough Hygrometers all seem useless to unreliable unless you spend a fortune .... humidity is clearly harder to read than temperature as even those 3 dollar thermometers with wired probes are remarkably accurate and reliable..
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