Marconi Instruments Limited was a British manufacturer of electronic test and measurement equipment, based in St Albans and Stevenage, England. The company was formed following the Marconi Company buy-out of Marconi-Ecko Instruments in 1941 and was sold to IFR Systems Inc. in 1998. The company was named after Italian inventor Guglielmo Marconi (1874-1937), a pioneer in radio and telegraphy who founded the Wireless Telegraph and Signal Company (later the Marconi Company) in 1897.