Extech SL400-NIST Datalogging Sound Level Meter, 30dB to 130dB, 8kHz max

The FLIR Personal Noise Dosimeter is a compact and lightweight device designed for sound level monitoring to determine necessary protective measures for employees exposed to loud noise. It allows for OSHA and IEC noise accumulation surveys to measure total sound exposure over an 8-hour period.

Optional 94dB calibrator for calibration checks per ANSI standards
Datalogs up to 999, 999 readings with sampling times between 1 second and 24 hours
Adjustable Criterion Level, Exchange Rate, & Threshold for flexibility
Sound level mode with display options for various measurements