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SPLnFFT Noise Meter on the App Store
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Sound Pressure Decibel Sound Level Meter 30-130dB(A) Noise Volume – Tekcoplus Ltd.
Monitor Classroom Noise with Bouncyballs.org - Classroom Freebies
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Digital Sound Level Meter Noise Tester Decibel Logger Volume Monitor – Tekcoplus Ltd.
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Decibel Meter Sound Level Reader 30-130dB(A), Hand-held Sound Noise Meter with Backlight Alarm, Digital Noise Meter Decibel Monitoring Tester Calibrated Audio Noise Volume Measuring Instrument: Amazon.com: Industrial & Scientific
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