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  1. YeOleBroodie

    Two springfield hygrometers -giving diff readings.

    Put them into a zip lock bag with salt thats been wetted down to resemble wet sand on the beach. Put in your hyg., seal it and wait a good 8 hrs. They should register 75% after that. Note the difference and then you go by that, either adding or subtracting to get the right RH.
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