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Amazon.com: Decibel Meter Digital Sound Level Meter with Data Record Function 30-130dB Range High Accuracy db Meter with LCD Backlight Time Display : Industrial & Scientific
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Decibel Meter Data Logger Professional Sound Level Meter High Accuracy Noise Meter with 30dB to130dB Measuring Range& Data Record Function for Classroom, Workshop, Home, etc.: Amazon.com: Industrial & Scientific
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