Feature:1. With small size and compact structure, ergonomically designed noise meter is comfortable to hold.2. Equipped with photosensor, it will automatically turn on the backlight when the light is insufficient, and automatically turn off when it is brighter.3. Press the Maximum button to automatically lock the current maximum decibel value and display it on the LCD when testing noise.4. Using highdefinition LCD display, reading data is clearer and more convenient.5. It is widely used for environmental noise measurement in factory, office, home and other places.Specification:Item Type: Noise MeterMaterial: PlasticWeight: Approx. 130g / 4.6ozMeasuring Range: 30dBA~130dBAAccuracy: 1.5 DB (94dB At 1KHz)Frequency Range: 31.5Hz~8.5KHzDigital Display: 4 DigitsMicrophone: 1/2 Inch Condenser MicrophonePower Supply: 6F22 9V Battery (Battery Not Included)Time of Endurance: About 30 Hours (Alkaline Battery)Working Condition: Temperature and Humidity: 0~40, 10~80%RHProduct Size: Approx. 149x53x34mm / 5.9x2.1x1.3in .Package List:1 x Noise Meter (Battery Not Included)1 x Manual