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Extech 407780A Integrating Sound Level Datalogger
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Radio Shack 33-2050 Sound Pressure Level (SPL) Meter
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GM-1357 30~130 dB Digital Sound Pressure Level Noise Decibel Meter Tes – Gain Express
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Realistic Sound Level Meter No 33-2050 Analog
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Sound Level Meter, 8928 AZ - AZ Instrument Corp.
