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Fnirsi Fdm01 Digital Handheld dB Meter 30~130dB Audio Measuring Instrument Noise Measuring Instrument, Find Details and Price about Noise Measuring Instrument 30~130dB Decibel Meter from Fnirsi Fdm01 Digital Handheld dB Meter 30~130dB Audio Measuring Instrument Noise Measuring Instrument - Shenzhen FNIRSI Technology Co., Ltd.