Extech 407355 Noise Dosimeter with PC Interface features: Measurement of total sound exposure over an 8-hour period; Perform OSHA and IEC Noise accumulation surveys; Adjustable Criterion Level, Exchange Rate, and Threshold; Ideal for personal/workplace accumulated noise exposure; Records/displays: % dose, dB level, exposure time, and peak events; Also has storage of 5 separate surveys, Bi-directional RS-232 with Windows® compatible software and a real time clock.