Belar Electronics Laboratory was started to supply radio stations with the newly required FM stereo monitoring equipment in 1964. The company later expanded to supply equipment needed by AM, shortwave and TV broadcasters. Belar is a leading manufacturer of modulation monitors, which are used by radio and television stations to monitor important technical aspects of a broadcast signal. Additionally, Belar makes frequency monitors, specialized AM receiving antennas and other related equipment for the broadcast industry. The FCC first used Belar monitors to verify measurement of commercial FM broadcast stereo performance standards in the mid-1960s. Since then, Belar monitors have become industry standards, used as test instruments by many broadcast industry manufacturers to ensure that products meet specifications. Belar markets its products domestically and internationally by direct sales and through distributors. The company is headquartered in Devon, Pa.