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VTSYIQI ND9B Digital Sound Level Calibrator 1/2" Diameter Microphones 0.3dB Accuracy Sound Voice Decibel Meter Dosimeter Calibration Instruments with 94 dB and 114 dB Sound Pressure Level: Amazon.com: Industrial & Scientific
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Extech - Sound Meter Accessories; Type: Sound Calibrator; Output Level (dB): 94.00; For Use With: Extech Sound Level Meters with 0.5″ or 1.0″ Microphones - 00253278 - MSC Industrial Supply
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