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Decibel Meter Sound Level Reader 30-130dB(A), Hand-held Sound Noise Meter with Backlight Alarm, Digital Noise Meter Decibel Monitoring Tester Calibrated Audio Noise Volume Measuring Instrument sold2024 while is practically invisible inDecibel Meter Sound Level Reader 30 130dB(A), Hand held Sound Noise Meter with Backlight Alarm, Digital Noise Meter Decibel Monitoring Tester Calibrated Audio Noise Volume Measuring Instrument This sound meters are widely used for monitoring noise level in factories, offices, theaters. The voice meter is good to use in various areas, such as neighbor noise complaints, industrial office setting and music recording How to Set the Alarming value? 1.