Founded in 1833, Jaeger-LeCoultre (JLC) is a luxury watch and clock manufacturer based in Le Sentier, Vaud, Switzerland.
In 1844, he measured the micrometre (µm) for the first time and created the world's most precise measuring instrument, the millionometer, capable of measuring to thousandths of a millimetre.
In 1847, LeCoultre developed a system that eliminated the need for keys to rewind and set watches, using a push-piece that activated a lever to change from one function to another.
In 1851, he was awarded a gold medal for his work on timepiece precision and mechanization at the first Universal Exhibition in London.
Watches sold in North America were sold under the LeCoultre name from 1932 to approximately 1985. After that the Jaeger-LeCoultre name was adopted uniformly worldwide. According to factory records, the last movement to be used in an American LeCoultre watch shipped out of Le Sentier in 1976.
Jaeger-LeCoultre has produced other measuring instruments, such as speedometers and fuel meters, under the Jaeger brand. The Jaeger instruments for automobiles were mostly used by the French automobile makers Citroën, Peugeot and Renault. Jaeger speedometers and tachometers were also supplied to British sports cars manufacturers such as Triumph. Many Italian cars such as Ferrari have used Jaeger automobile instrumentation.