This professional-grade sound level meter offers dual A/C frequency weighting and covers 30-130 dBA or 35-130 dBC, meeting IEC651 Type 2 and ANSI S1.4 Type 2 measurement standards. It features fast/slow response switching, a bar-graph display for quick visual reference, and an AC/DC output port for connecting to external recorders or analyzers. Designed for safety engineers and industrial hygiene professionals, it self-calibrates in seconds and runs roughly 30 hours on standard batteries.