Calibrating the Hygrometer Experiment - Pictures & Video

I found a great article on how to do a saturated salt calibration on hygrometers using a quite larger dish! He brings up the excellent point that you want to read the area 3 inches above the salt slurry, it contains air with a predictable humidity value. I used this method and it works!

https://ambientweather.com/faqs/question/view/id/1599/
 

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