A device used to measure sound intensity is called a sound level meter. This instrument captures the pressure level of sound waves and converts those measurements into a standardized decibel (dB) scale. Sound level meters often have various settings to account for different environments, allowing for accurate assessments of sound intensity in various contexts, whether in a loud concert setting or quiet laboratory. These devices are essential in numerous fields, such as acoustics, environmental monitoring, and workplace safety, providing critical data to ensure compliance with noise regulations and overall sound quality.