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A noise testing machine, also known as a "noise meter", is a measuring instrument used to measure and evaluate the noise emissions of machines, equipment or vehicles. It works on the basis of sound measurement and is capable of detecting the sound pressure levels and frequencies of the noise. Noise testing machines are used in a variety of industries, including automotive, aerospace, mechanical engineering, and sound engineering. They are used to ensure that noise emissions from machinery and equipment comply with applicable laws and regulations that govern environmental noise pollution. The results of a noise test can be shown on a display and can be documented in a sound level log. In this way, designers, engineers and manufacturers can improve the noise performance of their products and ensure that they meet the requirements needed for use in a specific environment.