If you have a tupperware or ziploc bag and
distilled water, you can do the salt test to see if they're accurate.
You take a bottle cap from something like a jam jar, fill it to just below the rim with salt, then put in enough
distilled water to turn it to slush without it spilling. That and the meter(s) go in a ziploc or tupperware sealed on the kitchen counter out of the sun. Leave it there overnight (I don't like to rush these things), and in the morning it should read 75% RH.
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