Rain gauge
Metal instrument for measurement of rainfall and other pre-cipitations / From Wikipedia, the free encyclopedia
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A rain gauge (also known as udometer, pluviometer, ombrometer, and hyetometer) is an instrument used by meteorologists and hydrologists to gather and measure the amount of liquid precipitation over a predefined area, over a period of time.[1] It is used to determine the depth of precipitation (usually in mm) that occurs over a unit area and measure rainfall amount.