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@forms
I'm recalibrating my hygrometer at the moment. Although the instructions state that to do this, I should leave the hygrometer in a zip-lock bag with some wet salt for 4 hours, I've taken Dale's advice, and am leaving it in for 24+ hours. My bedroom gets pretty hot when the heating's been on for a while, and the RH in my coolidor regularly fluctuates between 2% and 5% (depending how long the heatings been on for). So I'm wondering, when the 24+ hours are up and I am pressing the claibrate button on my hygrometer, should I be worried about the temperature in my room (which is where I'm recalibrating)?
When I press the calibrate button, my hygrometer automatically goes to 75% RH (as that's what the RH shoud be in the zip-lock bag with the salt). But if that's the base point for the hygrometer - where it works RH out from, surely if the room was 10 degrees colder when I pressed the calibrate button, the hygrometer would be basing the RH on a differnet percentage...
Does that make sense? Am I explaining it properly?