Specialized equipment category for accurately measuring and inspecting dimensions, shapes, and contours of products and components. Includes a wide range from contact-type measuring instruments such as calipers, micrometers, and height gauges to non-contact measuring equipment including coordinate measuring machines, vision measuring systems, and laser measurement devices. Essential measuring instrument group for ensuring dimensional accuracy and shape precision in quality control, product inspection, and process management. Also includes dedicated shape measuring equipment such as surface roughness testers and roundness measuring machines.