Yw-532X Noise Pollution Studies Digital Sound Level Meter - China Sound Level Meter, Noise Meter | Made-in-China.com
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USB Digital Sound Level Meter (Range 40dB - 130dB)
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Decibel Scale Chart Vector Illustration. Measuring Noise Pollution Levels For Work Safety Normative And Healthy Urban Environment. Educational Max And Min Volume Amplitude Threshold Examples Diagram. Royalty Free SVG, Cliparts, Vectors, And
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