The tachometer calculates your average speed over a distance of one kilometer
or one mile.
Measure the time it takes to travel one kilometer or one mile (1-60-sec.register).
The position of the seconds-hand on the tachometer scale marks your average
speed in kilometers per hour or miles per hour.
T a c h o m e t e r *
Only the chronographs being certified chronometer are accompanied by the
certificate attesting that the movement has successfully passed all the tests
of the Swiss Official Chronometers Control (C.O.S.C.) and that its precision
and its reliability have been tested over a period of 15 days, in 5 different
positions and at 3 different temperatures.
The personalized number engraved on your watch and marked on your certifi-
cate corresponds to the chronometer’s movement number and guarantees
that your chronograph is a Chronometer certified by the C.O.S.C.
T A G H e u e r C h r o n o m e t e r *
*According to series
