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Digital Professional Noise Decibel Calibration Sound Level Meter Calibrator 94dB & 114dB for 1/2" and 1" inch Microphone, Tool Measurement Accuracy Check (Noise Decibel Calibrator): Amazon.com: Industrial & Scientific
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Class 1 Sound Level Calibrator for Sound Level Meters and Environmental Noise Monitors
B&K Precision CAL73 Standard Acoustic Calibrator
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