How to calibrate a hygrometer?
If you have an analog hygrometer, you want to make sure it is as accurate as possible for the best results and use. To achieve this, there is a simple calibration test you can follow on your own to achieve maximum accuracy called the salt test. The best part is, it only takes a few steps.
But WAIT! Why are you bothering with this time-consuming test when you can purchase a digital hygrometer that never has to be calibrated, like the TP50!