... auto test range conversion,wide dynamic range, 2.GB/T 3785,1-2010,GB/T 15952,IEC61672 3.30-year experience TL5618B individual ... sound exposure sound level meterIt meets IEC 61672 standard, GB/T 3785,1-2010, and the second class sound level ... , automatic measuring range conversion, wide dynamic range,GB/T 3785,1-2010, IEC61672,GB/T 15952LCD digital displayfrequency range: 20Hz-12.5kHz Modal ...