Designed for safety compliance and exposure monitoring, the Casella CEL-620B sound meter digitally measures sound level in factories, refineries, construction sites or other workplaces where noise is a concern. In addition to assuring compliance to government regulations, such as OSHA, ACGIH and NIOSH, it helps occupational hygienists in quickly identifying and eliminating noise factors. Casella USA,, (800) 366-2966. Sound meter