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. Item Type: Noise Meter Material: ABS Measurement Range: 30-130dB Sampling Rate FAST: 125ms Sampling Rate SLOW: 1000ms Noise Accuracy: ±1.5dB Reference Sound Pressure Standard: 94dB or 1KHz Frequency Response: 31.5Hz-8KHz Resolution: 0.1dB Transducer Type: 1 or 2 Inch Condenser Microphone Auto Power Off: Approx. 10 Minutes Battery: 1.5V AAA x 3 ( Shipped Without Battery ) Operating Current: Approx. 18mA Operating Temperature: 0℃-40°C Operating Humidity: ≤80 percent RH Storage Temperature: -20°C-60°C Storage Humidity: ≤80 percent RH Overall Size: Approx. 195 x 73 x 34mm or 7.68 x 2.87 x 1.34in 1 x Noise Meter 1 x Screwdriver 1 x Velvet Bag 1 x Manual