Precipitation is not an instrument. It is a weather phenomenon where water falls from the atmosphere to the Earth's surface. Some common forms of precipitation include:

* Rain: Liquid water droplets.

* Snow: Frozen water crystals.

* Sleet: Frozen raindrops.

* Hail: Large frozen water droplets.

* Drizzle: Very light rain.

While instruments are used to measure precipitation, precipitation itself is not an instrument.