Professional Approved Sound Meter: Sound decibel meter Suitable for measuring noise in indoor environments; external noise measurement; electrical noise measurement; library noise measurement; room noise measurement. Fast and accurate test The sound decibel meter using the high-precision condenser microphone can measure the sound quality in various environments without contact and display the test results quickly and accurately. Accurate detection Digital sound certified decibel meter is processed by high precision chip, the detection range is 30~130dB, the frequency range 30Hz~ 8 kHz, the performance is excellent and the service life is long. Fast and slow measurement The sound level meter has the function of converting the fast and slow response rate. The fast response rate uses a time constant of 0.128 s/hour for general environmental measurement. The slow response rate uses a time constant of 1 s/hour, which is used for environmental measurements with relatively large changes in noise levels. Mini and lightweight The sound level meter is lightweight and easy to transport. It is widely used in factories, transportation, automobiles, baby room offices and sound systems, sound quality control in homes, schools, and construction sites.