The RT-5001 is an environmental noise pollution monitor that measures noise pollution levels from 0 to 150 dB across A, B, and C weighted frequency networks with fast and slow response characteristics. It is a portable, hand-held, battery operated device that is calibrated to national standards and includes a digital display, wind shield, carry case, and 12-month warranty. The monitor complies with ISO 14001:2015 standards and its calibration certificate is acceptable for ISO audits and noise level readings can be used in courts of law.