... 61672-1:2002 Class 2 2.Frequency Range:20Hz~12.5KHz 3.Wide dynamic range 4.Small and light weigh ... °C to 50 °C Complies with IEC 61672 Class 2 USESWidely use in Industrial Noise Surveys ; machinery, vehicles, ships ... is A, C, Z; Y is F, S, I; N can be 1—99), SEL, Lex,8h, Lavg, TWA, ... 5m, 10 m, 20 m, 30 m, 1 h, 2 h, 4 h, 8 h, 12 h, 16 h,24h Manual, ... 10 m, 20 m, 30 m, 1 h, 2 h, 4 h, 8 h, 12 h, 16 h, 24 h1 ...