Pluviograph precipitation gauge or rain gauge is an instrument for measuring the precipitation

A precipitation gauge or rain gauge is an instrument for measuring the precipitation that has fallen in a certain time interval. Snowfall is usually also recorded, insofar as it melts to its water equivalent.
Other names are ombrometer (ancient Greek ὄμβρος ombros "[heavy] rain, downpour" and -meter), hyetometer (ancient Greek ὑετός hyetos "rain") or pluviometer (Latin pluvia "rain").
A pluivograph (Latin pluvia "rain".and γράφειν gráphein "to write") is a measuring device for detecting and recording rain in a continuous, temporal course. It is therefore a recording rain gauge that controls a writing arm via its specific input measuring method. This in turn has a writing attachment at its tip, with which it transfers the course of the temperature to a rotating paper drum and thus displays it graphically. The time span of the recording is determined by the rotation speed of the paper drum.