How to Calibrate a Hygrometer

0 comments / Posted Jun 20, 2016

A hygrometer is an instrument that measures the humidity in the atmosphere. It is a useful tool to have in your humidor as long as it is accurate. Analog hygrometers should always be calibrated upon installation as it is a mechanical device and can get out of whack during shipment. From time to time you may need to check the calibration of your hygrometer especially if you have problems maintaining the proper humidity in your humidor.

There are 2 main methods to calibrate the hygrometer:

1. Salt with distilled water method. First remove any rubber grommets (if any) from your hygrometer. Then follow the steps below:

a. Place a teaspoon of salt in the bottle cap or small cup and dampen it with a few drops of distilled water (without dissolving it).

b. Carefully place the wet salt and the hygrometer inside a see-through container and close tightly. You can use a zip-lock bag provided it seals well and yu leave some air inside as well.

c. Let it sit for at least 6 hours and note the reading on the hygrometer without opening the container. the hygrometer should read 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.

d. If you have an analog hygrometer, you can correct the reading. you will need to adjust the needle to the 75% mark by turning the screw on the back using a small screwdriver. Your hygrometer is now ready to be placed inside your humidor.

2. Boveda hygrometer calibration kit method. Simply place your hygrometer inside Boveda's calibration kit. Wait for 8 to 12 hours.

And there you have it, simple methods on how to calibrate your hygrometer!

Now that you know how to calibrate a hygrometer, take a look at our premium hygrometer collection by clicking HERE.

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How to Calibrate a Hygrometer

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