As it is known to all,the X-431 Heavy Duty is designed to cover heavy duty diagnostic diesel vehicle models of 12V & 24V voltage; Allscanner VCX HD (VCX Heavy Duty) is PC-to-vehicle interface compatible with multiple software applications, it is available to diagnose most of heavy trucks, Buses, Grabs, Cranes and Engineering Machines for minimizing your investment in multiple brand-specific diagnostic interfaces, plus universal truck scanners like Xtool PS2 truck heavy duty diagnostic.