... sound exposure meter standard of GB/T 15952.digital detection, automatic measuring range conversion, wide dynamic range,GB/T 3785 ... ,1-2010, IEC61672,GB/T 15952LCD digital displayfrequency range: 20Hz ... Leq, Lmax, Lae, E, Tm (time of measuring)4 digits LCD digital displayPower 2 pieces of batteriesPower consumption:25mA more than ...