A chronograph is a watch with both timekeeping and stopwatch functions. Chronographs were produced as early as the 18th century, but they did not become popular until the 1820s.

Kinds

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Analog chronographs shows both time and stopwatch functions, with analog hands. Typically the center hand will be used for stopwatch functions, while subdials may indicate "permanent" seconds, stopwatch minutes and hours, and in some quartz chronographs tenths or hundredths of a second.

Digital chronographs will use a digital display for both timekeeping and stopwatch functions, either with separate displays or by switching modes on a single display.

Analog-digital chronographs will have a standard analog watch with permanent center seconds, and a separate digital display that will usually operate independently of the analog section. A flyback will reset to zero and then continue to run when the reset button is pushed while the stopwatch is running, whereas most mechanical chronographs will only reset to zero when the stopwatch is stopped.

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