To measure humidity you need a hygrometer. It is a tool that measures the amount of moisture in the air.
With a Humidity measuring device
It is measured in terms of percentage of humidity. A device to measure humidity is called hygrometer. The relative humidity of air can be measured by dry and wet bulb method.
Humidity.
by a measure of the quantity of water vapor in the air
Temperature is the amount of heat in a substance, so it's a measure of how fast something's molecules are moving. Humidity is how much water vapor is in the air. Temperature and humidity are different, but they are connected: both are features of the weather, and higher temperatures generally cause higher humidity, while lower temperatures cause lower humidity.
Humidity meters are used to measure the humidity outside. Typically, these would be placed on the outside of your house to accurately measure the humidity.
With a Humidity measuring device
Humidity
A small inexpensive instrument for measuring humidity is called a Hygrometer (sometimes they are also called relative humidity indicator or humidity sensor). These instruments measure humidity.
Relative humidity
2 instruments are required to accomplish these measurements:a barometer to measure atmospheric pressure.a hygrometer to measure humidity.
A device used to measure humidity is called a psychrometer or hygrometer.
Humidity
Humidity refers to the degree of wetness of the atmosphere. By using a humidity gauge or sling psychometer, humidity in the backyard can be measured.
There is no such thing as a sygrometer, but a hygrometer is a device that is used to measure the humidity of the air. It can indicate relative humidity or absolute humidity.
Like in a Hygrometer to measure humidity you use percentage (%)
hygrometer used to measure density of relative humidity in air by using a sensory element such as a hair