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How to Calibrate a Hygrometer

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How to Calibrate a Hygrometer - Mix Salt and Water
adding water to salt to calibrate hygrometer

Add water to the salt in the coffee cup.

Lianne McLeod
Place 1/2 cup of salt in the coffee cup, and add the water. Stir for a bit to totally saturate the salt. The salt won't dissolve in this amount of water; instead, the salt should have the consistency of wet sand.

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