Measures frequency weighted noise exposure and peak (C, Z) sound level Optional 94dB calibrator to perform "before" and "after" calibration checks per ANSI standards USB interface with Windows"-compatible software to control setup and retrieve stored events or analyze real-time measurements Datalogs up to 999,999 readings when used as a sound level meter with sampling times between 1 second and 24 hours Sound level mode: displays sound level, min/max, time-averaged sound level (Leq), peak, and sound exposure level (SEL) Adjustable Criterion Level, Exchange Rate and Threshold One user-defined measurement setup