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The dial is clearly legible, despite the relatively small diameter and lots of information it displays, but it also features an inventive version of the Tachymeter scale. Most tachymeter scales stop at 60 km/h, as when you measure over the course of 1 kilometer, you drive 60 km/h when it takes a minute to cover this distance. On this Heuer, this shows in red against the white enamel dial.
When one minute is passed, the minute hand of the chronograph jumps to the blue box, indicating that the blue tachymeter scale is now the one to read the correct speed. This Heuer even had a third scale in black, making it possible to measure speeds as little as 20 km/h.
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