Image measuring instrument, also known as optical measuring instrument and non-contact measuring instrument, anime measuring instrument, 2.5 dimensional measuring instrument, with the upgrading of modern industrial high-precision and micro manufacturing industry, non-contact mode has become the trend of the times. Breaking through tradition and adopting non-contact optical imaging measurement methods for fast and precise measurement of geometric dimensions and positional tolerances has become inevitable. Due to its powerful application in the field of micro precision measurement, it has become an increasingly accepted fast size measurement method in more and more mainstream application areas. Optical measuring instruments are suitable for all application fields aimed at coordinate measurement, and are widely used in industries such as machinery, electronics, instruments, hardware, plastics, etc. It overcomes the shortcomings of traditional vernier calipers, micrometers, and projectors, and is a high-precision and highly reliable measuring instrument that integrates optical, mechanical, electronic, and computer image processing technologies, including molds, screws, metals, accessories, rubber, PCB boards, springs, hardware, electronics, plastics, aviation, aerospace, etc. The measured object is magnified by an optical amplification system, and the image features are collected by a CCD camera system and sent to a computer. It can detect the contours, surface shapes, dimensions, angles, and positions of various complex and precise components, and automatically perform microscopic inspection and quality control. Measurement data can be imported into AUTOCAD as complete engineering drawings, generating documents in formats such as DXF and IGS. It can also be input into WORD, EXCEL, and SPC statistical analysis software to generate CPK and various statistical reports.