Multiplexer for PTT & LTT Size (W x L x H): 6 3/4" x 6 3/4" x 1 3/8"Connects 1-4 sensors to the Torque Analyzer and switches between the sensors manually or automatically.Eliminates the need to plug and unplug sensors.When the PTT or LTT is connected to the Multiplexer it reviews the Multiplexer (Mux) to determine what sensors are connected and downloads the identity and calibration data for each of the attached sensors.