Correct Answer: Hygrometer

Solution : The correct option is a Hygrometer .

A hygrometer, invented by Leonardo da Vinci, is a device used to measure the air's humidity level. Dew-point, electrical, and mechanical hygrometers are some of the different types of hygrometers available. Absolute humidity reflects the amount of moisture in the air, whereas relative humidity shows the amount of moisture present concerning the maximum amount of moisture that air mass can hold.