The Rain Gauge is used to measure the amount of rainfall over a specified area.
The rain gauge has a collecting funnel at its entrance, which is designed to minimize the loss of rain by splashing. The rain falls through an aperture at the base of the funnel into a collecting jar, which is seated inside an inner can to collect any overflow. The rainfall is then measured, usually once per day, by pouring the collected rainfall into a separate measuring jar. The base of the gauge is splayed outwards at the bottom to provide additional stability.