- Nov 3, 2010
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I would recommend calibrating any hygrometer. Put half cup of salt in a cup with quarter cup of water (should be like wet sand consistency) put cup and hygrometer in a large plastic bag, seal bag and wait 10-12 hours. The hygrometer should say 75% humidity. If it says anything else, you know which way to adjust when you're using it; if it says 70% add 5% each time you read it.
That was from another thread on here. That is how I do mine except I usually wait 24hrs before reading the hygrometer. I have those digital ones from walmart that are like 8bucks so when I calibrate the I write how far off they are with a permanent marker above the humidity reading. The one I am using right now says -10 because it reads 10% lower than what it actually is!
That was from another thread on here. That is how I do mine except I usually wait 24hrs before reading the hygrometer. I have those digital ones from walmart that are like 8bucks so when I calibrate the I write how far off they are with a permanent marker above the humidity reading. The one I am using right now says -10 because it reads 10% lower than what it actually is!