A: Can you test it with the salt method?
- To test your hygrometer using salt, you just need a few household supplies:
A small food storage bag that zips
A tiny cup or bottle cap from a 20-ounce soda
Some table salt
Water
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Put salt on the lid and add an appropriate amount of water to make a thick slurry. You don’t need to add too much water, just let the salt become wet. In case you accidentally add too much, you can use a paper towel to absorb the excess water.
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Put the cap and the hygrometer inside the baggie. Zip it up and place it somewhere out of the way, so it won’t be disturbed during the test.
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Wait 6 hours. The hygrometer will measure the humidity inside the bag during this time.
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Read the hygrometer. If it shows a humidity of exactly 75%, then it’s accurate.
Click here for more details about salt method: How to Test a Hygrometer: 6 Steps (with Pictures) - wikiHow
Note: Please place the hygrometer vertically in the bag to avoid blocking sensor detecting port and causing inaccuracies.
