Analog / Dial Hygrometer. Place about 1 teaspoon of salt in a small shallow open container, such as the cap to a jar. The hygrometer should should read 75%. If you have an analog hygrometer, you can correct the reading. If you chose to use an analog version, know that you should recalibrate your hygrometer at least once every two months to be sure you are getting an accurate measure of humidity. If you have an analog hygrometer, you can correct the reading. This is carried out by following the following steps: Although humidity gauge is pre-set at the factory, its calibration may be off within this range for various reasons. To calibrate, you need plain table salt, a few drops of water and a see-through Tupperware container with a tightly fitting lid. The most effective method of calibration for hygrometers, be it digital or analog, is the use of a salt paste. The hygrometer should read 75%. Below are the steps. For example, if your hygrometer reads 70% during the salt method test this means that to obtain the real humidity level you should add 5 points. For most analog hygrometers, simply adjust the needle to read 75% on the gauge by turning the screw on the back of the hygrometer with a small screwdriver. With that said, here are two main tips of what needs to be done for calibrating your hygrometer: Table Salt Method. Analog hygrometers, while cool looking, are notorious for inaccurate readings. Analog hygrometer calibration is not so different from calibration a digital hygrometer, but there are a few differences here and there. For species that like 70-85% RH use damp salt in a bowl placed in a ziplock bag with the hygrometer. If you have a digital hygrometer, use the buttons to adjust it to 75 percent. So you purchased a humidor, seasoned it, and you are ready to load in your cigars. Analog hygrometers are manufactured with a factory tolerance of +/- 5% points of humidity (and sometimes more) through the normal range of 40-80%. How To Calibrate an Analog Hygrometer. Calibrating digital and analog hygrometers are actually very easy. Place some salt in a bottle cap or small cup and dampen it with a few drops of water with out dissolving it. Calibrating a digital or analog hygrometer Calibrate your hygrometer to the application. If your hygrometer is reading below or above 75%, you will need to adjust the reading to register 75%. The difference is how much your hygrometer is off. For example, if your hygrometer reads 70% during the salt method test this means that to obtain the real humidity level you should add 5 points. Analog (dial-type) hygrometers are often shipped from the factory out of spec. The difference is how much your hygrometer is off. These hygrometers require regular calibration and maintenance more than digital ones do. If your hygrometer shows a humidity lower or higher than 75 percent, you'll need to calibrate it so that it's accurate when you use it to check the humidity of your humidor. Follow this step by step method for the perfect calibration. The hygrometer should read 75%. You need to wrap the hygrometer in a thoroughly moistened cloth and then wait for an hour. To check if your analog hygrometer is reading correctly, use the salt method to test it’s accuracy. Many digital hygrometers can be adjusted with a button. Another way to test calibrate the analog hygrometer is through removing the hygrometer from the humidor. After an hour, you have to adjustthe hygrometer on the rear with a screwdriver to 96% rel. Calibrate Your Hygrometer Using The Salt Method. humidity. If you have an analog hygrometer, turn the knob to adjust it to 75 percent.

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