The Mustang Dynamometer designed boom arm is a wall mounted unit containing two 180° swivels covered with zippered bellows. The arm extends approximately 58 inches from the wall. The enclosure at the end of the arm can be swiveled 330° by the operator using the side mounted handles.

A National Instrument's controller and remote I/O modules are mounted in the boom enclosure. A remote communications cable runs inside the boom arm back to the operator's control computer mounted outside of the test cell. Various analog, digital and thermocouple connectors are mounted on the front panel of the boom enclosure for the connection of customer supplied test leads.