How accurate is your hygrometer?
This is an interesting test that takes advantage of some of the unique properties of saturated salt solutions.
Take about HALF A CUP OF TABLE SALT, and a QUARTER CUP OF WATER, and mix them together in a coffee cup by stirring for about a minute.
Place the coffee cup containing this mixture into an AIR TIGHT CONTAINER such as a large Ziploc bag or a sealed pressure cooker, along with the hygrometer(s) you want to test. You must have an air-tight seal, and make sure the hygrometer doesn't come in direct contact with the salt solution.
Put all this in a room temperature location where the temperature will remain fairly constant for about 24 HOURS (away from drafts, direct sunlight, hot air vents).
After about 24 hours, check the reading on your hygrometer through the clear plastic bag, or immediately upon opening your air-tight container. IT SHOULD READ 75 PERCENT.
Remember, this only tells you if your hygrometer is accurate at 75%. It could still be way off at other readings.
Most hygrometers will change over time, so you might re-check every year or so.
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