Extech SL400 Personal Noise Dosimeter with USB Interface, External Microphone, and Hard Case

This lot includes one (1) Extech Instruments SL400 Personal Noise Dosimeter, a dual-function instrument that operates as both a noise dosimeter and a sound level meter. Designed for workplace noise exposure surveys, the SL400 performs OSHA and IEC noise accumulation surveys to determine total sound exposure over an 8-hour period. The unit features three measurement ranges (30-90 dB, 50-110 dB, 70-140 dB) with 0.1 dB resolution, A/C/Z frequency weighting, and adjustable criterion level, exchange rate, and threshold for compliance testing to different standards. In dosimeter mode, data logging stores up to 10,000 readings; in sound level meter mode, it logs up to 999,999 readings with sampling times from 1 second to 24 hours. Sound level mode displays real-time level, min/max, time-averaged sound level (Leq), peak, and sound exposure level (SEL). The USB interface connects to Windows-compatible software for setup, data retrieval, and real-time analysis. Powered by a 9V battery (006P or IEC 6F22). Serial number 200300184, made in Taiwan. CE certified. Lot includes the SL400 dosimeter, external microphone with windscreen, USB cable, and Extech branded hard carrying case. New condition from a commercial operation. Sold as-is.