This category encompasses specialized measuring equipment dedicated to gear precision measurement. It includes gear measuring machines, gear checkers, tooth profile measuring instruments, lead measuring instruments, pitch measuring instruments, and other devices that perform high-precision measurement of geometric parameters such as gear tooth profile accuracy, lead accuracy, pitch accuracy, eccentricity, and tooth thickness. These essential equipment groups are indispensable for gear quality control in automotive, industrial machinery, and gearbox manufacturers, addressing complex gear-specific shape measurements that conventional dimensional measuring instruments cannot handle. From CNC gear measuring machines to portable gear measuring devices, they support a wide range of measurement needs and facilitate quality inspection and process control after gear machining.