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level meter should be calibrated. Usually it should be
calibrated once a year. Standard sound source is required for
calibration. Please contact our company for specific method.
IX. Notes
1. Do not use the meter in hot, humid environment.
2. If the meter is not to be used for a long time, remove the
batteries to avoid electrolyte leakage damaging the
instrument.
3. Auto gear level (30-130 dB) is not suitable for measuring
transient impact noise.
4. When you measure sound level outside, anti-wind ball
should be installed on the microphone head to avoid blowing
directly into the microphone and generating airflow noise.
5. If “ ”symbol displays on the LCD, it means that the
battery voltage is too low. You should immediately replace
batteries. It is recommended that you use alkaline batteries.
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