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Ljudnivåsmeter, also known as a sound level meter, is an instrument used for measuring sound pressure level. It typically consists of a microphone, a signal conditioner, and a display. The microphone converts sound waves into electrical signals, which are then processed to determine the sound pressure level. The display shows the measured value, often in decibels (dB).

Sound level meters are used in a variety of applications, including noise monitoring in workplaces, environmental noise assessments, and acoustic testing of products. They are essential tools for ensuring compliance with noise regulations and for understanding the acoustic properties of environments and devices.

There are different types of sound level meters, ranging from basic models for general measurements to advanced instruments for professional use. Advanced meters often include features such as frequency weighting (e.g., A-weighting, C-weighting) to mimic human hearing sensitivity, and time weighting (e.g., fast, slow) to account for the temporal characteristics of sound. Some meters can also log data over time, allowing for detailed analysis of noise patterns.

Calibration is a critical step in using a sound level meter to ensure accuracy. This involves comparing the meter's readings to a known sound source to verify its performance. Regular calibration is recommended, especially for meters used in professional or regulatory applications.