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Digital Sound Level Meter Calibrator 94dB & 114dB for 1/2" and 1" inch Microphone, Professional Noise Decibel Calibration Tool Measurement Accuracy Check (Digital Sound Calibrator) : Amazon.ca: Tools & Home Improvement
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Amazon.com: Sound Meter Decibel Level Calibrator Calibration with Noise Measurement Reader Output Sound Level 94dB & 114dB output levels for 1 inch and 1/2 inch Microphones : Industrial & Scientific
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