For Chronometer we have terms and definitions in 5 topics. The topics are Boating, Clocks, Maps, Watch and Watches.

Chronometer (Boating)

An extremely accurate timepiece.

Chronometer (Clocks)

Clock or watch often used on board ship that gives excellent timekeeping.

Chronometer (Maps)

An extremely accurate clock that is relatively unaffected by movement or temperature changes
circulus equinoctialis -

Chronometer (Watch)

A precision watch that is set in various temperatures and positions, thus meeting the accuracy standards set by an official watch institute in Switzerland. Most watch companies either provide this certificate with a purchase or it can be mailed to you.

Chronometer (Watches)

Technically speaking, all watches are chronometers. But for a Swiss made watch to be called a chronometer, it must meet certain very high standards set by the Swiss Official Chronometer Control (C.O.S.C.). If you have a Swiss watch labeled as a chronometer, you can be certain that it has a mechanical movement of the very highest quality-- undergone a series of precision tests in an official institute. The requirements are very severe: a few seconds per day in the most unfavourable temperature conditions (for mechanical watches) and positions that are ordinarily encountered.

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