Description: * This sound level meter is novel, small and portable. It is applicable for measurement of noise engineering, quality control, health prevention and various environmental noise, including noise measurement in such various places as factories, offices, transporting routes and families, etc. * This sound level meter can read between 30dB-130dB, while reducing the effects of wind noise to produce more accurate readings. The sound meter provides readings within +/-1.5dBA providing some of the most accurate results! * Manual/Auto Shut Off,The meter will automatically power off by default for 10 minutes without any operation. * When measuring the noise outside, please mount the wind-resistant ball on the head of the microphone to prevent the microphone from being directly blown by wind and measuring other noise. Specification: Measures 30-130dB on digital display with white backlight High accuracy: +/-1.5dB accuracy with 0.1dB resolution Frequency Response 31.5Hz~8KHz Frequency Weighting Features A Weighting Working Temperature and Humidity 0~40℃，10~80%RH Storage Temperature and Humidity -10~60℃，0~90%RH 3*1.5V AAA Batteries Power Source(Not Included) External Dimension 56.1*177*36.03mm MIN/MAX/Lock Current Value Manual/Auto Shut Off. Low Battery Alert Fashional Design, Small and Portable Package Includes: 1 Piece Sound Level Meter 1 Piece Wind-resistant ball 1 Piece User Manual