Feature:1. Wide Application: This decibel meter has a wide range of applications and can be used in noise engineering, quality control, filming site, construction site noise, automobile noise, home school health protection and other fields.2. High Accuracy: This digital sound level meter ensures the high level of accuracy over a range of noise levels from 30 to 130dB, guaranteeing accurate readings every time.3. Quick Response: Whether you are monitoring sudden or gradual noise changes, the noise measure device is capable of fast sample rates of 125ms and slow sample rates of 1000ms.4. 1 or 2 Inch Condenser Microphone: This sound level meter utilizes a 1 or 2 inch condenser microphone to provide consistent, reliable and accurate detection of even the smallest noise decibels, so they don't go unnoticed.5. Backlight Color Display: This noise meter features a backlit color display that not only provides clear readings, but also ensures that the user can operate the unit in a variety of different lighting conditions.Specification:Item Type: Noise MeterMaterial: ABSMeasurement Range: 30-130dBSampling Rate FAST: 125msSampling Rate SLOW: 1000msNoise Accuracy: 1.5dBReference Sound Pressure Standard: 94dB or 1KHzFrequency Response: 31.5Hz-8KHzResolution: 0.1dBTransducer Type: 1 or 2 Inch Condenser MicrophoneAuto Power Off: Approx. 10 MinutesBattery: 1.5V AAA x 3 ( Shipped Without Battery )Operating Current: Approx. 18mAOperating Temperature: 0-40COperating Humidity: 80 percent RHStorage Temperature: -20C-60CStorage Humidity: 80 percent RHOverall Size: Approx. 195 x 73 x 34mm or 7.68 x 2.87 x 1.34in.Package List:1 x Noise Meter1 x Screwdriver1 x Velvet Bag1 x Manual