A sound level meters is a measuring instrument used to assess noise or sound levels by measuring sound pressure. It is commonly a hand-held instrument with a microphone. The sound level meters uses a directional microphone, which requires the instrument be pointed in the direction of the noise source unless ambient noise levels are being monitored. Sound level meters respond to fluctuations in air pressure caused by sound waves and are sometime referred to as Sound Pressure Level (SPL) meters . With a sound level meters, industrial hygiene and workplace safety professionals can measure sound levels in multiple locations to ensure environmental conditions fall within recommended exposure limits. Some sound level meters devices can be permanently installed for continuous monitoring of sound levels at a work or job site. Sound level meters are used for a large range of applications to determine objective measures of sounds, outdoors as well as indoors. The sound level meters is esse...