1. Application: This plug and socket test gauge is mainly used to test and inspect whether the structure and size of plugs and sockets conform to UL 498 standards. And the mainly application industries is electronics, electrical appliances, plugs and sockets and other similar areas.

2. Features: Gauge dimensions, tolerances, material, hardness, surface roughness conform to the standards requirements; Material hardness is more than 50HRC;Material thermal expansion coefficient is small,dimensions and tolerances is stable and reliable.