What tool is primarily used for measuring a vehicle's frame and body dimensions?

The tool primarily used for measuring a vehicle's frame and body dimensions is a frame measuring system. This system is specifically designed to accurately determine the structural integrity and alignment of a vehicle's frame. It provides precise measurements that help in assessing whether the frame has sustained damage and if repairs are necessary to restore the vehicle to its original specifications.

Frame measuring systems often utilize various components such as laser technology, measuring rods, and sheets that map out the specific dimensions of the vehicle. These systems allow technicians to identify deformities and misalignments that need to be corrected during the repair process, ensuring the vehicle's safety and performance standards are met.

While other tools can be useful for different measurements, they do not provide the same level of specificity or are not specifically tailored for frame measurement. For example, a wheel alignment tool is more focused on wheel positioning rather than overall frame integrity, while a digital caliper is used for more precise small measurements and a tape measure is less accurate when it comes to complex body structures. Hence, the frame measuring system is the most reliable tool for this purpose.