Calibration-
http://www.cigarmony.com/calibratinghygrometers.aspx
Humidor Seasoning-
http://www.cigarasylum.com/vb/showth...ight=seasoning
To check the seal on your humidor, assuming its a desktop, lift the lid 3-4 inches and drop. You should hear the air "whoosh" out, the lid should not slam shut. It if slams shut, they you probably have a leak. You may be able to find the leak by checking with a flashlight inside and looking for light escaping. You can also put a dollar bill in various places around the edge. If it slips out too easily in one place that is where you are leaking. Apply some painters tape in small strips around the edge where you find the leak.
