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Another humidor accessory is the hygrometer. If you want to know the exact humidity inside your humidor you will need a hygrometer to check for changes in the humidity level. As a rule of thumb, if humidity drops under 65%, it is time to add distilled water to the humidifier.
You will find in the market analog and digital hygrometers. Analog hygrometers (like the one in the picture above) are commonly made with a metal spring, but some are made with natural or synthetic hair.
Digital hygrometers (like the one in this paragraph) take a few seconds to show changes in humidity level, but they are easier to read and do not require calibration. This does not mean that they are 100% accurate, so you still need to check the calibration of your hygrometer whether it is analog or digital.
To check your hygrometer’s calibration, there is a simple test using salt. Place your hygrometer inside a ziplock bag. Also inside the bag, you will place a small container with table salt that you have moistened with a few drops of water. Seal the bag and wait at least 6-8 hours. Check the hygrometer without opening the bag. The hygrometer should read 75%, the relative humidity of the salt/water mixture. With analog hygrometers you can adjust the needle to the correct humidity by turning the screw on the back of the hygrometer. If you own a digital hygrometer all you need to do is add or subtract the difference when reading.