This Sound Level Meter is designed for noise project; quality control; illness prevention and cure and all kinds of environmental sounds measurement. It is applied to the sounds measurement at factory; school, office, traffic access and household, etc. Standard applied: IEC61672 -1 CLASS2; Accuracy: +1.4dB; Frequency range: 31.5Hz~8kHz; Display: 4 digits LCD display with the resolution of 0.1dB.