To protect the surface of the material, decorative covering layer, such as coating, plating, coating, paste layer, chemical film coating thickness to generate professional supplier in a number of national and international standards called cladding layer (coating ). Coating thickness measurement has become the processing industry, surface engineering quality testing an important part of the product to achieve superior quality standards necessary means. To make international products, China's export commodities and foreign projects, with a clear coating thickness on the requirements. Coating thickness measurement methods are: wedge cut method, light cut, electrolysis, the thickness difference measurement method, gravimetric method, X-ray fluorescence method, β-ray backscatter method, capacitance method, magnetic and eddy current measurement Measurement method and so on. The first five of these methods are destructive testing coating thickness measurement means cumbersome, slow, and more suitable for sampling. X-rays and β-ray method is non-contact non-destructive measurements, but complex and expensive equipment, measuring range is smaller. Due to radioactive sources, users must comply with radiation protection norms. X-ray method can be measured very thin coating, double coating, metal coating. β-ray method is suitable for the coating and the substrate atomic number greater than 3 coating measurements. Capacitance method is only the thin insulating the conductor used when coating thickness measurement. As technology advances made in recent years, especially after the introduction of computer technology, the use of magnetic and eddy current thickness gauge method to micro, intelligent, versatile, high-precision, practical direction one step further. Measurement resolution reached 0.1 micron coating thickness wholesale, precision can reach 1%, have increased significantly. It is suitable for a wide range of wide range, easy to operate and inexpensive, is the most widely used industrial and research the thickness gauge. Using non-destructive method does not damage the substrate coating is not damaged, test speed, can make a lot of testing work carried out economically. Magnetic force measurement principle and the thickness permanent magnet (probe) and the magnetic attraction between the size of the steel in which the distance between the proportional relationship, the distance is the thickness of the coating layer. Thickness is made use of this principle, as long as the coating layer and the substrate of the difference between the permeability of the coating thickness is large enough to use, can be measured. Given that most industrial uses cold-rolled structural steel and hot-rolled steel sheet metal forming, so the magnetic gauge most widely used. Thickness basic structure consists of magnet, reed relays, ruler and self-stopping mechanism. Pull magnet and the measured object, it will gradually lengthen the measuring reed thereafter, tension increases. When the tension just above suction, magnets pull out of the moment to record the size of coating thickness can be obtained. The new product can automate this recording process. Different models have different ranges and for occasions. Welcome to consult Nanchang Xing Feng Instrument Co., Ltd. (http://www.tianyiyuanyiqi.com), be sure to specify when you contact through the "Business Alliance Member" see, thank you! Contact: Zhengjing