Double rattrapante Beyond the simple "stop watch" function, a rattrapante chronograph also allows lap-time measurements, time comparisons, and the determination of the fastest or slowest of several laps. With conventional rattrapante chronographs, these measurements are confined to the seconds scale and thus limited to a duration of 60 seconds. The double rattrapante mechanism developed by Lange has an additional rattrapante hand for the minute counter. This makes it possible for the first time to meaningfully exploit the rattrapante functions - for events that last up to 30 minutes.

Flyback This complicated mechanism in the movement of the DATOGRAPH allows the user to instantly set the chronograph seconds hand to zero during an ongoing measurement. When the push-piece is released again, a new measurement starts without delay. This transforms the conventional sequence of "stop", "set to zero", and "start" steps into one single step.

The LANGE DOUBLE SPLIT is the gateway to a new dimension in horology. For the first time in the history of mechanical wristwatches, Lange has created a | flyback chronograph with a | double rattrapante feature. Its unique rattrapante minute counter allows comparative measurements of up to 30 minutes.