The sound level meter is a measuring instrument for mandatory verification. If the verification agency only issues a calibration certificate or a test report, it means that the performance index of the sound level meter cannot meet the requirements of GB/T 3785.1-2010 (IEC 61672-1:2013), and the verification is unqualified according to the verification regulation JJG 188-2017.

The measurement range of the sound level meter is the main technical index of the sound level meter. This technical index represents the technical advancement of the product to some extent. Generally, the wider the measurement range, the better. The measurement upper limit of the sound level meter is determined by the maximum undistorted sound level of the sound level meter, which can generally reach 130 dB; if a high sound pressure level (for example, 172 dB) needs to be measured, a high sound pressure microphone must be selected. The measurement lower limit of the sound level meter has a lot to do with the self-generated noise of the sound level meter itself. If you want to measure low sound level noise, you should choose a sound level meter equipped with a high-sensitivity microphone.