Victorinox CHRONOGRAPHS Watch - Manual (Page 46)

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TACHYMETER
The tachymeter scale, located on the inner bezel of the watch, enables
the speed of a moving body to be read off in km/h (or in some other unit
of measurement). Measure the time taken to travel one kilometer (or a
different unit) and read the result on the tachometer scale. For example,
the time taken is 40 seconds, equivalent to a speed of 90 km/h.
CHRONOGRAPH FUNCTIONS
Measurement of Partial Times (Addition Function)
A. Press pusher A to start timing. Further pressure on Pusher A
will stop the timing operation. The chronograph will indicate
the final time.
B. Once the timing operation has been stopped, press Pusher B.
The chronograph and totalizer hands will be reset to zero.