Thickness Gauge Operation: 1 zero, that is up-regulated in a particular zero zero plate, or in the original substrate to be measured increases to zero; 2 Depending on the measuring range of measurement products, measured with the appropriate test piece adjusted value plating layer Thick instrument to reduce measurement errors. Under this method in general, or when there is no problem using a newly purchased equipment, just a little more complicated. But when the probe is used for some time, the problem came out. Operation in our measurement precision is greatly reduced. Difficult to grasp. The reason is that the principle of the product, which is a fatal flaw water gauge, that the probe is to use a magnet around the coil. After generating a magnetic field through the current, the magnetic field is irregular. Fortunately, there is now a new type of coating thickness gauge, which uses the latest magnetic induction technology. This is what we know of the Hall effect, Hall discovered in 1879. By studying the relationship between the Hall voltage and the operating current measured electromagnet magnetic permeability relationship between the Hall voltage and the magnetic field, Hall found that the potential difference UH IH and the current strength is proportional to the magnetic flux density is proportional to B, d is inversely proportional to the thickness of the sheet. This field is to become the rule. The principle used in the coating thickness on top of it without having to re-tune the test piece. Especially when measured arc or concave product even easier to use and convenient. Rockwell hardness (HR) when HB> 450 or the sample is too small, can not be used and instead Brinell hardness test Rockwell hardness measurement. It is with an apex angle of 120 ° diamond cone or ball diameter 1.59,3.18mm, under certain load is pressed into the surface of the test material, determined by the depth of the indentation hardness of the material. Depending on the thickness of the test material hardness, in three different scales to represent: HRA: 60kg load and is using a diamond indenter charge into the device obtained hardness, high hardness of the material used (such as carbide, etc. ). HRB: 100kg load and is using 1.58mm diameter hardened steel balls hardness obtained for the lower hardness of the material (such as annealed steel, cast iron, etc.). HRC: 150kg load and is using a diamond indenter remanded finds a hardness, high hardness materials (such as hardened steel, etc.) are used. Ultrasonic thickness gauge, Golden Section Instruments (online consultation), thickness provided by the Qingdao Branch of the Instrument Co., Ltd. Qingdao Branch of the Instrument Co., Ltd. (www.qdjk17.com) is in Qingdao, Shandong analysis instruments leaders, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. Branch of the Instrument in leadership with the staff warmly welcome all inquiries negotiations to create the Branch of the Instrument better future.