Extech 407744 94dB Sound Calibrator for 0.5" and 1" Microphones

Extech HD600 Datalogging Sound Level Meter (Discontinued by the Manufacturer)

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EXTECH HD600 SOUND LEVEL DATALOGGER

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EXTECH HD600 SOUND LEVEL DATALOGGER

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Extech 407744 94dB Sound Calibrator for 0.5" and 1" Microphones