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It is important to take into account that this step is not necessary if a hygrometer of Adorini hair is used because it is pre-calibrated, and it is only necessary in case it has been hit during its transport.
There are two methods for calibrating an analogical hygrometer:
The most recommended and accurate method is to put the hygrometer with a salt solution in a little plastic box. A spoon of salt should be added and it has to be dampened with a few drops of water.
The salt should not be dissolved, but absorbing the water. After that, place the hygrometer and the salt in a plastic box well sealed and wait for 8 hours until the box reaches 75% humidity. Later, fit the hygrometer hand with a screwdriver to indicate the 75% humidity.
Another possibility is to take the hydrometer off the humidor and wrap it in a damp cloth. You have to wait for 1 hour approximately and then, adjust the hygrometer with a screwdriver in 96% relative humidity.
There are two methods for calibrating an analogical hygrometer:
The most recommended and accurate method is to put the hygrometer with a salt solution in a little plastic box. A spoon of salt should be added and it has to be dampened with a few drops of water.
The salt should not be dissolved, but absorbing the water. After that, place the hygrometer and the salt in a plastic box well sealed and wait for 8 hours until the box reaches 75% humidity. Later, fit the hygrometer hand with a screwdriver to indicate the 75% humidity.
Another possibility is to take the hydrometer off the humidor and wrap it in a damp cloth. You have to wait for 1 hour approximately and then, adjust the hygrometer with a screwdriver in 96% relative humidity.