Sheet metal square pipe fitting is an essential component with wide applications across industries. In the automotive manufacturing sector, it is a core element of vehicle body structures, and its quality directly affects the stability and safety of the entire vehicle. In the electronics and electrical fields, from computer cases to mobile phones, square pipe fitting is an indispensable component. Additionally, it plays a significant role in medical devices, self-service equipment, and many other areas. Therefore, it is necessary to ensure precise measurement of these components.