1) Meteorological yardstick 2) Pluviometer 3) Precipitation measurer 
(from the article `climate`) The amount of precipitation falling during a fixed period is measured regularly at many thousands of places on Earth`s surface by rather simple rain ... Direct measurements of precipitation are made by a variety of gauges, all of which consist of some form of funnel that directs the infalling water to ... ...
An instrument used to measure rainfall amounts.
Instrument that measures the rain that falls at a location over a period of time.
An instrument used to measure rainfall amounts.
[n] - gauge consisting of an instrument to measure the quantity of precipitation
meteorologist tool that measures the amount of rainfall
An instrument to measure rainfall.
rain gage noun gauge consisting of an instrument to measure the quantity of precipitation
A device that measures how much water a garden gets, either by rainfall or watering; keeping one in the garden can help you to determine if and how much to water plants