Car is a fixture standard used to measure and evaluate the quality of parts size of special test equipment. Accurate install on the fixture parts, and then through the visual (fixture engraved with the corresponding error tolerance for contour line), or check gauge (fixture parts), or caliper profile for parts, check around, can also with the help of inspection bolt or visual components on different properties of hole and the connection position between the parts and parts for inspection.

　　Good car fixture standard parts should meet the following requirements: 1, fully understand the function condition of products, and the classification of function. 2, accord with the requirement of man-machine engineering to learn. 3, with three-dimensional detection function, can detect all aspects of the product. 4, easy maintenance, easy to carry, marked clearly.