Calibrating a Hygrometer

Knittycat

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13 Years
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I have my hygrometer sitting in a plastic zip-loc bag with a cup containing 1/2c salt and 1/4c water.
What temperature should I let this sit at? Room temp? That's hovering in the upper 60s at the moment. Should I put it in the window to catch the sun? Or should I quit worrying LOL
 

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