Hygrograph vs. Hygrometer — What's the Difference?

An automatic hygrometer that records variations in atmospheric humidity.

A hygrometer is an instrument used to measure the amount of water vapor in air, in soil, or in confined spaces. Humidity measurement instruments usually rely on measurements of some other quantities such as temperature, pressure, mass, a mechanical or electrical change in a substance as moisture is absorbed.

Any of several forms of automated hygrometer that record humidity.

Any of several instruments that measure atmospheric humidity.

An instrument for recording automatically the variations of the humidity of the atmosphere.

(meteorology) An instrument that measures the humidity of the air or other gases, especially the relative humidity.

An instrument for measuring the degree of moisture of the atmosphere.

Measuring instrument for measuring the relative humidity of the atmosphere