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2.2 eddy current thickness gauge and magnetic vortex and magnetic thickness gauge are generally small, portable devices, respectively, utilizing the eddy current principle and the principle of electromagnetic induction. Dedicated to a variety of specific coating thickness measurement, for measuring film, there may be an error of the thickness of the sheet.

2.3 ultrasonic thickness gauge ultrasonic thickness gauge are mostly small portable devices, the use of ultrasonic reflection principle, can be measured the thickness of the metal, plastics, ceramics, glass and any other good conductor of ultrasonic waves. It can operate at high temperatures, which is a lot of other types of thickness are not available, but the kind of selective detection sample.