Feature: 1. Multifunctional: This digital sound level meter has the features most users need while eliminating unnecessary features. With dual AC and DC signal outputs, it will meet most consumer needs. 2. Extra Large LCD Screen: This digital decibel reader has an extra large, clear backlit LCD display that shows measurements clearly. You can turn on the backlight to easily take readings at night and reduce eye damage. 3. Good Performance: This sound level meter responds in fast mode within 125 milliseconds and in slow mode within 1 second, with a +/‑ accuracy of 1.5 dB and a resolution of 0.1 dB. the frequency range is from 30 Hz to 8 KHz (the frequency is not digitally displayable on the screen). 4. A Weighting Function: This decibel monitoring tester has an A weighting function, which simulates the frequency characteristics of low intensity human ear noise, and is suitable for the detection of environmental noise. 5. Wide Application: This sound noise meter has a wide range of applications and can be used in many environments, it is also suitable for noise engineering, product quality control, health prevention, treatment and so on. It is an excellent tool for checking, monitoring or controlling and testing environmental sound levels. It is suitable for industrial noise measurement and monitoring in traffic road, automobile, machining and so on. Specification: Item Type: Sound Level Meter Material: ABS Battery: 3 x AAA Battery (Not Included) Measurement Range: 30-130dB Accuracy: ±1.5dB Frequency: 31.5Hz-8.5KHz Frequency Weighting: A/C Digital Display: 3.5 Digits, Resolution 0.1dB, Sampling Rate 2 Times/Second AC Signal Output: Available DC Signal Output: Available Response Time: Fast, Slow Microphone: 6mm Condenser Microphone Storage Function: 1 Record/Second, Continuous storage up to 17 hours Computer Communication: Connect to computer via Micro USB cable Application: Traffic Roads, Cars, Mechanical Processing and other Industrial Noise Measurement and Monitoring. Package List: 1 x Sound Level Meter 1 x USB Cable 1 x Manual