... High PrecisionModular Design - on Demand SelectionWide Warm Design, Operating Temperature from -15 °C to 50 °CComplies with IEC 61672 ... Class 1 USESWidely use in Industrial Noise Surveys ; machinery, vehicles, ships ... , ELXYp, LXeq,T, LXYmax, LXYmin, LN (Note: X is A,C, Z; Y is F, S, I; N can be ... °C ~ 50 °C AWA 5661 Precision Impulse Sound Level Meter Class 1