Chronographs are watches that can measure time in different ways. Besides normal timekeeping they can be used for one or more specific time measurements. For this, the dial has several sub dials with a scale, from which the measurements can be read. A central second hand can be started and stopped, without interfering with the continuous time.
Some also include additional features such as a countdown timer and lap time.
In short, one can measure elapsed time , split time, lap time, accumulated elapsed time.
Terminology used in this advertisement is as under.
Crystal: The mineral or synthetic (glass-like) covering over the watch dial.
Sapphire Crystal: Scratch resistant crystal.
Crown: The button on the side of the watch, usually at the 3 o'clock position, used to set the functions of the watch, i.e., hands, calendar, etc.
Bezel: The ring around the dial of a watch that can hold crystal in place. In some watches (e.g., diver's watches) this can be rotated to show elapsed time as well as other functions.
Tachymeter: A watch function that measures the speed at which the wearer traveled by means of a numeric scale on the watch bezel of a chronograph. Frequently used to determine a speed of a car over a measured distance.
Today, wearing a chronograph is a matter of taste, rather than professional. The chronograph is becoming a fashion statement. A chronograph is quite valuable. It is more expensive than a normal or automatic watch, due to the complexity and craftsmanship necessary for manufacturing. That is why maintenance and repair are quite costly
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