Tachymeter: probably the most common feature on a chronograph, a tachymeter (also called tachometer) measures the speed at which the wearer has traveled over a measured distance. The wearer starts the chronograph when passing the starting point and stops it when passing the finish. The wearer can then read the speed in units, in this case, miles per hour, off the tachymeter scale.
Lap timer�a chronograph function that lets the wearer time segments of a race. At the end of a lap, he stops the timer, which then returns to zero, to begin timing the next lap.
Lap memory�the ability, in some quartz sport watches, to preserve in the watch�s memory the times of laps in a race that have been determined by the lap timer (see lap timer). The wearer can recall these times on a digital display by pushing a button.
12-hour recorder (or register) �a subdial on a chronograph (see �chronograph�) that can time periods of up to 12 hours.
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