... 61672 Class 1 2.Accurate testing results 3.RS-232 interface ouput are available 4.Impulse sound level FEATURESLatest Digital Signal Processing ... from -15 °C to 50 °CComplies with IEC 61672 Class 1 USESWidely use in Industrial Noise Surveys ; machinery, vehicles, ships and ... , 20m,30m, 1h, 2h, 4h,8h, 12h, 16h, 24h1s~24hMainParameters of MeasurementLp, Lmax, LpeakLp, Lpeak, Lmax, Lmin, SEL, ELXYp, LXeq,T ...