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A watch with timing functions that are displayed in subdials on the face of the watch. Most chronographs are comprised of three subdials, and can measure fractions of seconds, minutes in increments other than 60, and hours in other than one-hour increments. Chronographs should not be confused with chronometers, which are devices with accuracy so exact that they have met special time standards set by the Swiss Official Chronometer Testing Institute (C.O.S.C.).
See also: Chronometer, Watch Anatomy.
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