Hi I’m Kayla with Cheaphumidors.com and today we are going to go over how to calibrate a hygrometer.
We are looking at both analog and a digital hygrometer and you’ll need to calibrate both. A lot of digitals will say that they are pre-calibrated in the factory, but we usually recommend that you do a quick calibration just to make sure.
There are two main ways that we calibrate hygrometers. The first way is by far the easiest; it’s using a one step calibration kit, they’re made by Boveda.
They’re zipper bags with a small humidipak inside, and you just put the hygrometer inside the bag and seal it up. You want to wait 8 to 12 hours and at the end of this time, the hygrometer should be reading 75%. If it’s not, you just adjust it.
So now, if you don’t have a calibrating kit, it’s not a problem. You can use what we call a salt test. For this method you will need a small bottle cap, regular table salt, a reclosable bag and regular water.
All you need to do is fill the small bottle cap with about a tablespoon of salt and you’re going to get the salt wet. You don’t want salt water, you just want damp salt. So you have just pasty salt, and you put this inside your re-closable bag. Then you are going to add your hygrometer. You’re going to make sure the sensors are clear and able to read the humidity levels. So for a digital, you have the sensors here so you want those facing up. For an analog, they can read from the back underneath the magnet or from the sides underneath the grommet. Those small holes allow it to read humidity so you want to make sure those are clear when you put it in the calibrating bag.
So again, you put it in, seal it up, and wait 8 to 12 hours. At the end of that time it should be reading 75% and if it’s not, then you need to adjust it.
How to Calibrate Digital Hygrometers
For a digital, you can adjust it using the adjustment knob. A lot of people will turn it and notice that there is no change. You need to turn it however many clicks to the right or left it needs to go up or down and then press the reset button. Once you press the reset button it will register the change.
How to Calibrate Analog Hygrometers
For an analog hygrometer, you can adjust it using the adjustment screw in the back. You’ll need either a small screw driver or a small pocket knife and you just put it in and you’ll notice that if you just hold it lightly and spin it around, the whole dial spins. So you want to put some pressure on the outside of the hygrometer and it will hold steady enough for you to adjust.
So now after I have adjusted them, I usually put them back in the calibrating bag for another couple of hours just to make sure that the reading is now taking correct readings. After that you are all done and you’re ready to put it in your humidor.
This is Kayla with Cheaphumidors.com and this is how to calibrate a hygrometer.[VIDEO] How to Calibrate a Hygrometer by Kayla Becker