Features and Benefits: Special locking pliers clamp securely to any convenient object Range: 1 Graduations: .0011 Reading: 0-100 This checks ball joint wear and disc rotor run-out. Also checks gear backlash valve guide wear and camshaft wear. With optional attachments checks tire and wheel run-out. Eliminates vibration problems and false readings by mounting directly on spindle. This set comes packaged in plastic blow-molded case.