Toolmakers microscope is a kind of mechanical optical instrument based on optical (microscope) aiming and coordinate (table) measurement. It can be used to measure various lengths and angles. It is especially suitable for measuring various complicated tools and parts, such as thread, cam contour, cutting tool and hole spacing, etc. It can be divided into four types: small tool microscope, large tool microscope, universal tool microscope and heavy universal toolmakers microscope. They all have the basic characteristics of tool microscopes. In addition to the differences in measurement range and division value, the bearing capacity of the worktable, the type and quantity of accessories and the accuracy of instruments are also different.