heartfelt beads and hygrometer calibration

[Wharf Rat]

Originally Posted by timatraw

Im having a heck of a time getting an accurate calibration reading for my stinking hygrometers. Is it possible to use a cap full of 65% beads (half wet with distilled water) in a tupperware with the hygrometers and get an accurate reading? I am guessing that the RH should be 65% after 24 hours or so.
Will this work?
Has anyone tried this calibration method with success?
Thanks.
Tim

Well, the salt test is actually a calibration method that relies on some fundamental science. Its like using boiling and freezing water to calibrate a thermometer. The temperatures are known constants.

If you calibrate using the beads, than your hygrometer is basically calibrated using the same thing you're measuring. Its not independent.

Bob