A chronometer watch is a timepiece that has been tested and certified to meet specific precision and accuracy standards set by the relevant authorities, such as the Swiss Official Chronometer Testing Institute (COSC). Unlike regular watches, which may simply be marketed as "chronographs" (watches with stopwatch functions), chronometers are specifically recognized for their superior timekeeping capabilities. To be certified as a chronometer, a watch must undergo rigorous testing over a series of days in controlled conditions.
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