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Hand of Environmental officer holding to use sound level meter for monitor is part of the prevention of environmental impacts at Chemical plant area or refinery factory.
music graphic equalisers and audio analysis clip. shot from the display of a stereo hifi system
Digital sound level meter with display and control buttons on acoustic foam
Pollution is too loud.hand holding a digital sound level on a white background,Sound level meters are commonly used in noise pollution studies.
Sound level meter, loudness vector chart design on white background

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