1.digital detection,auto test range conversion,wide dynamic range, ... sound exposure meter standard of GB/T 15952.digital detection, automatic measuring range conversion, wide dynamic ... T 3785,1-2010, IEC61672,GB/T 15952LCD digital displayfrequency range: 20Hz-12.5kHz Modal TL5618B ... E, Tm (time of measuring)4 digits LCD digital displayPower 2 pieces of batteriesPower consumption:25mA more than ...