The SL400 is a personal noise dosimeter with USB interface. For employees exposed to loud noise, sound level monitoring is essential to determine what protective measures are needed. Perform OSHA and IEC noise accumulation surveys to determine total sound exposure over an 8-hour period. The SL400 is a compact, lightweight dosimeter with USB interface designed for noise exposure and provides noise monitoring for compliance with OSHA, MSHA, DOD, ACGIH and ISO standards. Includes PC software to control setup and retrieve stored events or analyze real-time measurements. Complete with belt clip, clip-on microphone (0.5 ", 12.7 mm), cable (81.3 cm) and windscreen, 9V battery, software, USB cable and carrying case.