A gauge is a special measuring tool used by industrial manufacturers to quickly inspect product size, shape and position characteristics, and is particularly suitable for quality control in mass production. It is a special inspection device that is mainly used to measure and evaluate whether the dimensional accuracy, shape tolerance and position characteristics of parts meet the design requirements. Its core functions include: Fast inspection: Online inspection at the production site can be achieved through visual inspection or simple measuring tools (such as calipers and dial indicators), significantly improving efficiency. Replacement of complex instruments: In mass production (such as automotive parts), it can replace professional equipment such as three-coordinate measuring machines and plug gauges to reduce costs.