The best way to test the humidity in your home is with a hygrometer. A hygrometer is a device that specifically measures humidity. It's an inexpensive and easy way to check the humidity level in your home. You can find hygrometers at most hardware stores and online retailers. Some hygrometers are digital, while others use a dial to display the humidity level.
Some smart thermostats also monitor the humidity level in your home. Learn more about the benefits of upgrading your home's thermostat.