It's winter where we live and the relative humidity is 75-90% (reported by weather departments).
I'm calibrating a digital thermometer/hygrometer with salt in a zip bag. Will air humidity drop down to 75% with starting air humidity higher than this? I've got half cup salt that is wet to soggy consistency.
Calibrating hygrometer
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aussieJJDude
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Re: Calibrating hygrometer
From my understanding yes. It works with equalibrium, and the salt will keep the humidity in balance.
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Re: Calibrating hygrometer
Thanks. I think it just took a bit longer (10-12 hours). The Bunnings cheap-o digital kit appears to be within 2% which is pretty good for $20!