Feature:*Wide measurement range: 30~130dB*Accuracy up to 1.5dB*This unit was designed according to following standards: ----A. International electrician committee standard: IEC PUB 651 TYPE2 ----B. US national standard: ANSI S1.4 TYPE2*100% BENETECH Brand New*With modern, compact, portable design.*Easy to use*Frequency weighting characteristic: A*Equipped with sponge ball to filter-out unwanted signals.*Max reading hold*Auto power off*Auto backlight display*Low battery indication*Powered by 9V Battery (not included)*Approved by CE/ROHS/FCC standard*Under 1 year guarantee Specification:*Measuring range: 30dBA~130dBA*Accuracy: ±1.5 dB*Frequency range: 31.5Hz~8.5KHz*Frequency weighting: A*Digital Display: 4digits*Resolution: 0.1dB*Sample rate: 2 times/second*Microphone: 1/2 inch electret condenser microphone*Power supply: 9V Battery*Operating condition: 0~40 10~80%RH*Storage condition: -10~60 10~70%RH*Weight: 144g (including battery)*Dimension: 57*26*149mm