... IEC 61672 Class 1 2.Accurate testing results 3.RS-232 interface ouput are ... from -15 °C to 50 °CComplies with IEC 61672 Class 1 USESWidely use in Industrial Noise Surveys ; machinery, vehicles, ships and ... ~ 20 kHz10 Hz ~ 16 kHzMeas. Upper Range>140 dB>138 dB>135 dB>160 dB>140 dBSelf—generatedNoise<20 dBA<18 dBA<10 dBA ... ,C, Z; Y is F, S, I; N can be 1—99) SEL, Lex,8h, Lavg, TWA, DOSE, E, SD, ...