Sound level meters are mandatory calibration measuring instruments. If the calibration agency only issues a calibration certificate or test report, it means that the performance indicators of the sound level meter cannot meet the requirements of GB/T 3785.1-2010 (IEC 61672-1:2013). According to the calibration regulations JJG 188-2017 failed the test.

1. Please do not use it in high temperature or humid places.

2. Please remove the battery if not used for a long time to avoid electrolyte leakage and damage to the instrument.

3. The automatic gear (30-130dB) is not suitable for measuring instantaneous impact noise.

4. When measuring sound levels outdoors, please install a windproof ball on the microphone head to prevent the microphone from being directly blown by the wind and causing airflow noise.

5. To ensure the accuracy of measurement, calibration is required. Fit the sound level calibrator to the microphone, turn on the calibration power, read the value, adjust the noise meter sensitivity potentiometer, and complete the calibration.