This document provides an instruction manual for the MB800 OBDII diagnostic scanner. It begins with an introduction and welcome message. Then it provides details on the scanner's functions and features, which include supporting various protocols, vehicle models, manufacturers, and trouble code types. It also outlines the scanner's main diagnostic menu options. The document continues with sections covering safety precautions, general diagnostic information, scanner overview, usage instructions, and individual diagnostic functions. It includes appendices with PID lists, readiness monitors, vehicle manufacturers, and other reference information.