Measuring instrument is the most significant features: fast, lossless, accurate. There are many factors that affect the test results of the gold measuring machine. Due to the special circumstances of the jewelry products, the method should be used by the method to detect and be familiar with the following factors (these factors in different circumstances will have a great impact on the collection of characteristic line intensity 2) the surface of the sample to be tested or chemically treated; 3) the time of measurement; 4) the size of the sample to be tested and the content of the material contained in the sample; Shape; 5) the size of the sample measurement; 6) how much the content of precious metals; spectrum of gold machine types in accordance with the appearance to distinguish, there are three, respectively, as follows: 1) desktop: desktop gold machine general volume, weight, External desktop computers, equipment, good stability, high re-dominant. 2) portable: small size, light we