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wrap it in a moist towel and leave it for about 15 or 30 minutes, the humidity should then read 100%, if not adjust it so it does.

My method requires no mechanical know-how, but does require that you know how to add and subtract: You need a digital hygrometer first, then you can calibrate your analog hygrometers. What you do is place both hygrometers in your humidor for about 5 minutes, then compare the two readings. If your digital reads 70 and your analog reads 75, then you know how far off your analog is. From then on, just subtract 5 from your analog readings. I hope this helps you, let me know.

isn't that the truth, I still have four of the digital ones, and put all of them in the cabinet, that has a hydrometer that I am assurred is of a professional accuracy, didn't matter, all five had different readings anyway, the temperature was close on all of them, but the humidity varied up to 15%!

fill a two liter soda bottle cap with salt. Put drops of water into the salt until it is completely wet-out, but not soupy. Put the cap into a short, stout glass. Put in hydrometer. Cover tightly overnite. The reading should be 75%, if not, adjust it quickly so it is. I find this works more accurately than the wet towel approach.