Sound and Noise Monitoring


Sound level meters and analyzers by Brüel & Kjær are class 1 sound measurement instruments with unrivalled ease-of-use and flexibility. In fact, the latest generation of our sound measuring instruments can be directly operated with a smartphone. With the addition of our specialized apps and post-processing software, you can set up and customize your instrument for an extensive range of measurements, advanced analysis and reporting. It's been over 60 years since Brüel & Kjær invented the world's first portable sound level meter. And we still lead the industry today.


A complete class 1 sound / noise measuring solution for dedicated measurement applications. B&K 2245 is designed with task-tailored Noise Partner Apps for specific measurement applications, providing you with the tools you need to get your job done.

A sound level meter is a measuring instrument, designed to measure sound levels in a standardized way.

Commonly referred to as a sound meter, noise meter, decibel meter, or sound pressure level (SPL) meter, a sound level meter is designed to respond to sound in approximately the same way as the human ear.

The purpose of a sound level meter is to give objective, reproducible measurements of sound pressure levels (SPL).

Sound level meters and analyzers are used to measure and manage noise from a variety of sources. They are often employed in environmental noise assessment from sound sources, such as industrial plants, road and rail traffic, and construction work.

In urban environments, noise pollution - or excessive noise exposure - directly affects the people who live and work in the affected areas. To ensure noise regulations are followed, noise is measured from a variety of sources as sports events, outdoor concerts, parks, and residential- or commercial neighbours. Each sound/noise source is defined by its own set of characteristics, which can pose challenges for the professionals assessing them.

Common measurement applications

  • Room and building acoustics
  • Sound power and noise source identification
  • Assessing workplace noise and OHS evaluations
  • Environmental noise measurements 


At its very core, a sound level meter basically consists of a microphone, a preamplifier, a signal processing unit, and a display.

The most suitable type of microphone for a sound level meter is a condenser microphone, which combines precision with measurement reliability. The microphone converts the sound signal to an equivalent electrical signal. The electrical signal produced by the microphone is at a very low level and must be enhanced by a preamplifier, before reaching the main processor.

Signal processing applies frequency weightings and time weightings to the signal, as specified by international standards such as IEC 61672 – 1, which a sound level meter complies with.

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