Extech Personal Noise Dosimeter With USB Interface, 30 to 140 dB

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