Integrating Sound Level Meter The sound level meter consists of a calibrated microphone, electronic circuits, and a display. The microphone detects small air pressure variations associated with sound and converts them into electrical signals. The aforementioned signals are then processed using the instrument's electronic circuitry. We are the leading supplier of Integrating Sound Level Meter. It's economic integrating sound level meter with leq and datalogging facility & ideal for environment noise monitoring purpose.Features: measurement - spl, leq, sel, maxl, minl, ln (5%, 10%, 50%, 90%, 95%)-measurement level - 30 - 130 db-4GB MicroSD CardAdditional Information:Packaging Details: Model No. 309