... sound exposure meter standard of GB/T 15952.digital detection, automatic measuring range conversion, wide ... 3785,1-2010, IEC61672,GB/T 15952LCD digital displayfrequency range: 20Hz-12.5kHz Modal TL5618B ... Frequency weighting ATime weighting Fast (F), Slow(S)Measuring timeManual,10s,1m,5m,10m,15m, ... , Tm (time of measuring)4 digits LCD digital displayPower 2 pieces of batteriesPower consumption:25mA more ...