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Sound Level Meter Calibrator 94dB & 114dB for 1/2" and 1" inch Microphone, Professional Noise Decibel Calibration Tool Measurement (Digital Calibrator 94dB & 114dB with LCD) : Amazon.co.uk: DIY & Tools
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Digital Professional Noise Decibel Calibration Sound Level Meter Calibrator 94dB & 114dB for 1/2" and 1" inch Microphone, Tool Measurement Accuracy Check : Amazon.co.uk: DIY & Tools
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