What device is commonly used for directly measuring precipitation?

A rain gauge is the device commonly used for directly measuring precipitation. This instrument is designed specifically to collect and measure the amount of liquid precipitation over a set period. Typically, it consists of a cylindrical container with a funnel at the top that directs rainwater into a measuring tube. The amount of collected water can be read on a scale, allowing for precise quantification of rainfall.

This method is effective because it provides direct measurements without the need for estimation or interpretation. It's widely used in meteorology and hydrology for weather reporting and monitoring water resources. Unlike radar, which can estimate precipitation over larger areas but does not measure it directly, the rain gauge gives a specific measurement at its location. Additionally, while a stream gauge measures the height of water in streams or rivers to infer flow and potential precipitation runoff, it does not measure the precipitation itself. A wind vane is used to assess wind direction and does not relate to precipitation measurement.