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The ThinkCar Truck HD HML Module Package is not a standalone diagnostic tool, but rather a specialized expansion module designed to significantly enhance the capabilities of compatible ThinkCar passenger vehicle diagnostic tablets. "HML" stands for Heavy, Medium, and Light-duty vehicles, indicating its broad coverage for commercial and industrial applications. This package transforms a compatible ThinkCar Machines (like the THINKTOOL Master, Master 2, Master X, THINKTOOL Pros, THINKTOOL MAX, and some Expert series models) into a professional-grade diagnostic tool for a vast array of commercial vehicles.