Features of sound level meters
Sound level meters have digital displays that give the sound pressure level in decibels. The microphone is set on top of the meter to minimize interference. The rest of the meter is in a hand-held size box.
How sound level meters work
A microphone on the top of the meter receives the sound sample. Inside the meter itself are electronic circuits that are used to amplify, filter, and analyze the sample. Meters that give a reading of the current sound pressure level are the most common. Integrating meters, which give a summation of the readings over time, require more complex internal mechanisms. Data logging meters take measurements at intervals over time.