TecMate CarbMate Carburetor / Fuel Injection Synchronizer The CarbMate provides balanced performance for both carburetor and fuel injection systems. Its bright LED display offers instant and accurate readings, ensuring that synchronization is accomplished swiftly and efficiently. Whether tackling routine maintenance or making adjustments, it stands as a reliable tool for optimal engine performance. Features: Precisely compares vacuum of two carburetors or throttle bodies Single horizontal 9 LED display for easy balance viewing which eliminates visual estimation errors of traditional gauges Cost-effective electronic replacement for mercury sticks Easily converts to synchronize three or four channels (accessory sold separately) Accurate to 0.5 cmHg (meets or exceeds OEM specs) Shock resistant and durable solid-state electronics Center green LED indicates perfect balance within selected resolution Simple Zero adjustment knob for quick pre-calibration Powered by any 12V battery source (cord with clips included)