1. Patented product intuitive and effective.
2. First time the trailer exclusive device is adopted separate measurement of main part and hang part self-developed patented product, intuitive measuring way and accurate data portable moving whole equipment, convenient for out-door work useful to solve tyre abrasing problem.
To inspect the distance between traction pin center to nearest vehicle bridge's axis. Isosceles triangle geometry principle is adopted to inspect and judge the setback for 1 bridge comparing to traction pin center. Also the theory of parallel is used to measure other bridge's parallelism. Also can judge coincident between vehicle bridge center and traction pin center. To check every bridge's comparative displacement.