A wristwatch chronometer is a type of watch that is designed to be extremely accurate and precise. Chronometers are certified by the Swiss Official Chronometer Testing Institute (COSC), which is an independent organization that tests and certifies the accuracy of timepieces.
To earn the designation of a chronometer, the watch must meet certain strict standards of accuracy and precision. The movement of the watch must be certified to keep time within -4 to +6 seconds per day, and it must pass a series of tests in various positions and temperatures to ensure that it maintains its accuracy in all conditions.
Chronometers are often made by high-end watch manufacturers, and they are prized by collectors for their precision and reliability. Many chronometers are also designed with additional features such as multiple time zones, stopwatches, and other functions that are useful for pilots, sailors, and other professionals who rely on accurate more...
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