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which guarantees the thickness measurement accuracy to a certain extent, but also to gauge the size and mechanical light brings some difficulties. Ambient temperature and wind speed can also affect the accuracy of the sensor must be used in the laboratory environment. Mechanical methods due to the different thickness of the sample contact area of ??the probe, different probe urging, urging different speeds, the same sample (here assuming uniform thickness) using different types of different thickness is likely to give test results, mainly due to the compressibility of the sample deformation rate in different situations often do not produce the same. Therefore, when using a mechanical thickness testing must be strictly enforced by the reference standard test conditions and test requirements.