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Amazon.com: RISEPRO Decibel Meter, Digital Sound Level Meter 30 – 130 dB Audio Noise Measure Device Backlight MAX/MIN, Data Hold Auto Power Off Dual Ranges HT-80A : Industrial & Scientific
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Amazon.com: Digital Audio Decibel Meter Sound Level Tester Noise Level Volume Measuring Instrument 30~130dBA Monitor Data Recording Self-Calibrated A/C Frequency Weighting Tool : Industrial & Scientific
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