Specification: High Precision The measuring range of the sound level meter is 30dB to 130dB . Highly accurate with 1.5 dB. Real-time monitoring can give you accurate data on the sound level in the area. . When the battery is low the LCD display will display a low voltage icon indicating that the power is low at this point and the battery needs to be replaced. Fast and Slow Response Rate Conversion The sound level meter has the function of converting the fast and slow response rate. The fast response rate uses a time constant of 125 milliseconds for general environmental measurement. The slow response rate uses a 1 second time constant which is used for environmental measurements with relatively large changes in noise levels. Convenient and Lightweight Riiai sound level meter is lightweight and easy to carry. The A-weighting simulates the frequency characteristics of low-intensity human ear noise which is suitable for the detection of ambient noise. Widely Used A sound level meter is an instrument used to measure ambient sound levels. It can be used in homes factories workshops schools residential areas offices streets hotels hotals laboratories theaters and sound syst the scope of application is very wide and an indispensable tool in life. Package Contents1 x Sound Level Meter2 x Batteries1 x ManualSound pressure accuracy1.5dB (94dB1KHz)5dB (94dB8KHz)frequency response30Hz 8KHzdynamic range50 dBmeasuring range30130dBAWeighting propertiesADynamic characteristicsFAST 125ms ?SLOW 1secMicrophonePolarized capacitance microphoneMAX/MINAuto Power OffLow battery indicationPower2x1.5VAAAbatteries Origin:Mainland China Measurement Range:30~130dB