What a great fourm this is!
I've calibrated small hygrometers before (that you place in a humidor) using the salt test, but now I have a larger humidor with a built-in hygrometer (analog) on the front.
Should I try to remove it and bag it with salt/distilled h2o, or is there another way? I've already seasoned the box and it's 1/4 full of hand rolled beauties

Thanks