Tel-Instrument Electronics Corp. engages in the design, manufacture, and sale of avionics test and measurement instruments for the commercial air transport, general aviation, and government/military aerospace and defense markets in the United States and internationally. The firm operates through the Avionics Government and Avionics Commercial segments. It provides instruments to test, measure, calibrate, and repair a range of airborne navigation and communication equipment. The firm's products include TS-4530A, an identification friend or foe test set, T-47/M5, a dual crypto test set, and AN/ARM-206, an intermediate level TACAN test set. It also offers AN/USM-708 and AN/USM-719 communications/navigation radio frequency avionics flight line testers, TR-220, a test set that provides test capability for traffic and collision avoidance systems (TCAS), distance measuring equipment, and transponders, TR-36, a commercial navigation, and communication test set that provides ramp testing, and TR-420, a ramp test set to test the operation of transponders and interrogators. In addition, the company provides multifunction ramp test sets under the T-47NC, T-47NH, and T-47G names, TR-100AF, a rugged ramp test used to verify airborne TACAN equipment, AN/APM-480A, a transponder, interrogator, and TCAS test set, and TS-4530i, a test set. It serves customers directly or through distributors. The company was founded in 1947 and is headquartered in East Rutherford, NJ.