What tool is primarily used for measuring unibody alignment?

The primary tool used for measuring unibody alignment is the frame machine. This tool is specifically designed to assess and restore the structural integrity of a unibody vehicle, which is a vehicle design where the body and chassis are a single unit. A frame machine utilizes pinpoint measuring equipment, which may include laser systems and extensive measuring points on the vehicle, allowing for precise alignment checks against manufacturer specifications.

This tool not only measures the alignment but also provides the capability to execute adjustments to align the structure accurately back to its original configuration after a collision or damage. Its ability to create a controlled environment during the measurement and repair process is crucial for achieving the correct alignments necessary for the overall performance, safety, and durability of the vehicle.

Other tools, while useful in various capacities, do not specialize in unibody alignment like a frame machine does. For instance, a laser level is helpful for leveling surfaces but lacks the specific measuring capabilities tailored for unibody structures. Similarly, a measuring tape is a general-purpose tool that lacks precision for structural analysis, and a digital caliper is better suited for measuring specific dimensions rather than overall structural alignment.