Clive Sinclair's first company Sinclair Radionics, established in 1962, made its name producing a wide range of cheap electronics aimed at the hobbyist market. Its products include amplifiers, radios, multimeters and other items which were generally sold in kit form to hi-fi enthusiasts and other electronics hobbyists. The company entered a new market in 1972 when it launched the first "slimline" pocket calculator, the Sinclair Executive. It was a major success that Radionics followed up by launching a wide range of pocket calculators. The company's subsequent expansion made it Europe's biggest calculator manufacturer by 1975.