The dial on the face of a chronograph used to measure the speed
in kilometres/metres per hour (and not miles). On the majority
of the Swatch Chrono models, the tachometric scale on the dials
(bezel) allows the reading of a speed measurement, directly in
kilometre per hour (Km/h). The speed measurement must be carried
out inside a time interval of maximum 60 seconds for distances
of 10, 100 or 1000 meters. For a measurement on 1000 meters, the
figure read on the tachometric scale corresponds directly to the
speed in km/h.For a measurement on 100 meters, the figure read
on the tachometric scale must be divided by 10 to obtain the
speed in km/h. For a measurement on 10 meters, the figure read
on the tachometric scale must be divided by 100 to obtain the
speed in km/h.