The CEL-63x Series of digital sound level meters are the most versatile of meters available; ideal for both noise at work applications (ISO9612, OSHA) and environmental measurements (BS4142). Ensure compliance with workplace noise legislation with the CEL-633 and assist with the selection of hearing protection. For environmental noise monitoring, the CEL-633 can be used for boundary noise assessment, noise nuisance complaints or in the construction industry, section 61 notices.