Udometers are devices used to measure rainfall. These instruments come in different varieties, and they differ in their operational mechanics and specifications. Some of the synonyms for udometers include rain gauges, pluviometers, and ombrometers. Rain gauges have been used for centuries to monitor precipitation, and they are still in use today. Pluviometers are used in meteorological stations and are more advanced than basic udometers. Ombrometers, on the other hand, measure both rainfall and snowfall and are used in regions that experience frequent snow. All these instruments are highly valuable for measuring the amount and intensity of rainfall, which is essential for climate monitoring and forecasting.