A decibel meter is a device used to measure the intensity of sound. It quantifies sound levels in decibels (dB), which is a logarithmic unit that expresses the ratio of a particular sound pressure to a reference level. These meters are commonly used in various fields, including environmental monitoring, construction, and music, to ensure sound levels are within safe and acceptable limits. Decibel meters can be handheld or installed as permanent fixtures. They often feature digital displays that show real-time sound levels and may include additional functions, such as data logging and frequency weighting. This makes them useful for assessing noise pollution and ensuring compliance with regulatory standards.