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Digital Sound Level Meter Calibrator 94dB & 114dB for Accurate Decibel Measurement, Noise Check and Acoustic Calibration - 1/2" and 1" Microphone Compatible".: Amazon.com: Industrial & Scientific
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SLTK-885B Digital Sound Level Meter Calibrator 94dB & 114dB for 1/2 and 1 Microphone Calibration - Tekcoplus Ltd.
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