Dunlop TRAK-RITE PPL 40+ is a laser alignment gauge designed for precise angle measurements between pairs of wheels on vehicles, providing accurate toe-in and toe-out readings. This device enables you to check and adjust wheel alignments, ensuring optimal tire performance, handling, and stability. The gauge can be used on various vehicles, including cars, vans, and commercial vehicles with single or twin steering axles. By following the assembly and calibration instructions, you can set up and operate the gauge effectively.