Sound Level Meter is a testing device to measure sound noise level, it is very needed especially for industrial environment, for example in aviation industry where the environment must be tested the noise level or sound pressure it generates to know the effect on the surrounding environment.
Why need a Sound Level Meter?
The simple answer, why the need to use SLM is to know what's going on. SLM measurements can also be used to verify exactly how many sound levels have changed. Anyone involved in sound system work recognizes that there is an ongoing problem and an increase in the volume level issues generated in public performance, and in particular, in the reinforcement of pop music.