This classification covers various types of gauges used for precision measurement of dimensions and shapes in manufacturing sites. It includes standard instruments essential for dimensional inspection and quality control of machined products, such as pin gauges, ring gauges, thread gauges, feeler gauges, taper gauges, and plug gauges. Distinguished from general-purpose measuring instruments like calipers and micrometers, this category specializes in dedicated measuring tools manufactured based on specific dimensions and shapes as standards. This encompasses high-consumption measuring tool groups used in dimensional accuracy assurance and inspection processes in precision machining, ranging from JIS standard products to custom-made items.