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3M Sound Detector SD-200 helps workers assess the need for hearing protection in noisy environments. A digital display shows the minimum, maximum and average decibel level (sound pressure levels) to help workers make informed decisions about hearing protection. Tri-color LED lights in green, yellow and red flash brightly when preset noise levels are reached, helping workers determine when hearing protection may need to be worn. Simple four-button navigation performs all functions, requiring little to no training for staff. This light and portable hand-held sound level meter comes ready to take measurements right out of the box with no configuration necessary. A lithium polymer battery provides up to 50 hours of use between charges. This detector is industry compliant, meeting applicable ANSI and IEC Class 2 standards. Specific standards include ANSI S1.4 1983 (R 2006), ANSI S1.43 1997 (r 2007), IEC 61672-1 (2002) and IEC 61010-1 (2010).