Designed for safety compliance and exposure monitoring, Model CEL-620B provides 20 to 140 dB range and real-time octave band frequency analysis from 16 Hz to 16 kHz. Full-color LCD presents overall noise levels in numerical and graphical formats. Up to 100 run results can be stored in internal memory. Instrument connects to PC using integral USB interface. It can digitally measure sound level in factories, refineries, construction sites, or other industrial workplaces.