The Autel MaxiHVAC AC909 is a 4-port manifold system designed to bring skill, understanding, and precision to HVAC diagnostics. The system provides step-by-step guided instructions for equipment hookup and the entire repair workflow. It also features a vehicle-specific overview of A/C specifications and locations, including compressor and refrigerant types. The tool introduces the use of Nitrogen for a pressure leak test, "system tightness test," and purge procedures for faster evacuation. According to the company, this is the first A/C manifold gauge tool that decouples from the A/C lines while still monitoring low and high pressures.