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Amazon.com: Portable GM1356 Digital USB Noise Meter Sound Level Meter Decibel Meter 30-130dB A/C FAST/SLOW dB + Software with Carry Box by Topekits : Industrial & Scientific
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Digital Sound Level Meter 30-130dB Decibel Pressure Tester USB Noise Measurement 0.1db Resolution: Amazon.com: Industrial & Scientific
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Digital Sound Level Meter With Usb Data Connection 40-130db Tester Volume Decibel Measuring Ta8152b Lcd Display | Fruugo NO
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-image-1.png "professional decibel meter for measuring two independent sources of sound signals")