# Chronometer

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Look up ***[chronometer](https://en.wiktionary.org/wiki/chronometer)*** or ***[chronoscope](https://en.wiktionary.org/wiki/chronoscope)*** in Wiktionary, the free dictionary.

**Chronometer** is a name for certain types of **[clock](/source/Clock)**. It may refer to:

- [Chronomètre of Loulié](/source/Chronom%C3%A8tre_of_Louli%C3%A9), a precursor to the metronome

- [Chronometer watch](/source/Chronometer_watch), a highly accurate watch

- [Marine chronometer](/source/Marine_chronometer), a timekeeper used for marine navigation, as in - [Longitude by chronometer](/source/Longitude_by_chronometer)

- [Observatory chronometer](/source/Observatory_chronometer), a device certified by an observatory to be extremely accurate

- [Railroad chronometer](/source/Railroad_chronometer), a specialized timepiece once used for safe operation of trains

## See also

- [Chronometry](/source/Chronometry), the science of timekeeping

- [Hydrochronometer](/source/Hydrochronometer), a water clock

- [Chronograph](/source/Chronograph)

- [Chronoscope](/source/Chronoscope)

Topics referred to by the same term

This [disambiguation](https://en.wikipedia.org/wiki/Help:Disambiguation) page lists  articles associated with the title **Chronometer**.
If an [internal link](https://en.wikipedia.org/w/index.php?title=Special:WhatLinksHere/Chronometer&namespace=0) incorrectly led you here, you may wish to change the link to point directly to the intended article.

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Adapted from the Wikipedia article [Chronometer](https://en.wikipedia.org/wiki/Chronometer) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Chronometer?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.