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2.1 mechanical thickness gauge thickness measurement using the most traditional methods, stable and reliable data, the sample is not selective, it can generally be divided into point-contact surfaces and contact categories, it is non-contact thickness measurement methods are essentially different - before the thickness measurement can exert a certain pressure (point contact or surface contact force force) to measure the sample surface, avoid using non-contact thickness measurement of those having certain compression, uneven surface It may occur when data is volatile phenomenon. Precision mechanical thickness depends on the thickness measurement precision components, the core components - measuring head and face in measuring minute vibrations are very sensitive, so the vibration source environment measurement accuracy does not make any sense. In order to avoid its own vibrations and to minimize the impact of external vibrations are used heavy equipment and a wide base made of metal.