Chronometer is a name for certain types of clock. It may refer to:

• Chronomètre of Loulié, a precursor to the metronome

• Chronometer watch, a highly accurate watch

Marine chronometer, a timekeeper used for marine navigation, as in

• Longitude by chronometer

• Observatory chronometer, a device certified by an observatory to be extremely accurate

• Railroad chronometer, a specialized timepiece once used for safe operation of trains

See also

• Chronometry, the science of timekeeping

• Hydrochronometer, a water clock

• Chronograph

• Chronoscope