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Amazon.com: Decibel Meter, Tadeto Digital Sound Level Meter Portable SPL Meter 30dB to 130dB(5 Measurement Range) Backlight LCD Display, MAX/MIN Noise Measurement, Audible and Visual Alarms,Data Hold, A/C Mode : Industrial &
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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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