Chronometer may refer to:
  • Chronometer watch
    Chronometer watch
    A chronometer watch is a specific type of watch tested and certified to meet certain precision standards. In Switzerland, only timepieces certified by the COSC may use the word 'Chronometer' on them....

    , a watch tested and certified to meet certain precision standards
  • Hydrochronometer
    A Hydrochronometer is a kind of a water clock.In 1867, Fr. Giovan Battista Embriaco created a Hydrochronometer, and sent it to the Paris Universal Expo of 1867, where it received many prizes...

    , a water clock
    Water clock
    A water clock or clepsydra is any timepiece in which time is measured by the regulated flow of liquid into or out from a vessel where the amount is then measured.Water clocks, along with sundials, are likely to be the oldest time-measuring instruments, with the only exceptions...

  • Marine chronometer
    Marine chronometer
    A marine chronometer is a clock that is precise and accurate enough to be used as a portable time standard; it can therefore be used to determine longitude by means of celestial navigation...

    , a timekeeper used for celestial navigation
  • Railroad chronometer
    Railroad chronometer
    Railroad chronometers, or Railroad Standard Watches, are specialized timepieces that once were crucial for safe and correct operation of trains in many countries...

    , a specialized timepiece once used for safe operation of trains in the United States and Canada

See also
  • Chronometry
    Chronometry is the science of the measurement of time, or timekeeping.It should not to be confused with chronology, the science of locating events in time, which often relies upon it.-See also:...

  • Clock
    A clock is an instrument used to indicate, keep, and co-ordinate time. The word clock is derived ultimately from the Celtic words clagan and clocca meaning "bell". A silent instrument missing such a mechanism has traditionally been known as a timepiece...

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