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Taidacent 12V Voice-Activated Delay Switch Sound Detection Relay Module Sound Sensor Module Voice Alarm

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Extech 407730 Digital Sound Level Meter 40-130Db

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Decibel Meter, Portable SPL Meter (Sound Pressure Level Meter), Digital Noise Meter, Range 30-130Db(A) Db Meter, Noise Volume Measuring Instrument

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