Sensibly, the Double Split has two sets of chronograph hands for recording two separate events, or only one event if that is your requirement. At the center of the dial are the usual hour and minute hands, and concentric to these are two chronograph seconds hands. To the lower left are two chronograph minute recording hands sharing the same chapter ring (sub dial). A closer look reveals that the seconds’ recording hands are of different colors - the upper white and the lower gold - while the minute recording hands are also of two different colors (blue and gold). Contrast to the respective dials, and sub dial colors, is the reason for this.

As it is with all split chronographs, there is a third push piece involved in the operation. Besides the usual two push pieces located at 2 o’clock and 4 o'clock, a third is located at 10 o'clock. It is this third button that controls the "split" action of the chronograph. Pushing the button at 2 o’clock sets the chronograph to action, with both seconds and minute recordings synchronized with each other, a typical way of recording a single event. Now a simple push of the button at 10 o'clock stops one of the seconds and minute recording hands to record the first event, and another push brings all the chronograph recording hands back into synchronization. This process can be repeated as many times as required.

But it is not merely the ability to record multiple events within split seconds and minutes that makes the A. Lange & Söhne Double Split special. An ingenious double clutch mechanism, controlled by two small hammers and two small heart-shaped cams, ensures the A. Lange & Söhne Double Split will not suffer any of the liabilities all other split chronographs have faced.