Feature:1. Mini noise meter with LCD display, accurate reading and quick response.2. Can be used for sound quality control in various environments such as factories, schools, and buildings.3. High sensitivity sensor, accurate measurement, fast and sensitive, convenient measurement.4. The noise measurement range is 35dB-135dB, and the accuracy is 2.0dB.5. Digital noise meter, small size, easy to carry, stable performance and long service life.Specification:Item Type: Sound Level MeterMaterial: PlasticModel: MT-911ABattery: 3 x AAA Battery (Battery Not Included)Display: LCD DisplayWorking Environment: Altitude Below 2000 Meters RH90% (No Condensation)Frequency Range: 31.5Hz-8KHzSampling Time: 300 MillisecondsDynamic Range: 50dBAccuracy: 2.0dBMeasuring Level Range: 35dB-135dBSize: Approx. 144x56x30.5mm / 5.7x2.2x1.2in.Package List:1 x Sound Level Meter (Battery Not Included)1 x ManualNote:1. Please allow 0‑1 inch error due to manual measurement. Thanks for your understanding.2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.