Par-Tech is an automotive service engineering company that specializes in developing service manuals, diagnostic tools, and other service information products. It has a headquarters and auxiliary garage facility in Detroit, Michigan and employs service engineers, technicians, illustrators, and other experts. Par-Tech provides services such as service manual development, diagnostic hardware and software, and technical support to automotive customers. It aims to give clients autonomy through web-based tools and process orders on their behalf while providing reporting on sales.