Modular Technology Interfaker 3 (model MT25-3) RS-232/V24 serial interface tester and breakout patch tool. Features three DB-25 connectors (Patch-1, Patch-2, Terminal), LED indicators for all 25 pins, and a reference chart for V24/RS232/DIN/NOM pin assignments. Case lid broken off with cracks and scrapes. Lights up when powered but functionality not fully tested. Battery not included. Includes ribbon cable.