The Triple Split is the first mechanical split-seconds chronograph in the world that allows multi-hour comparative time measurements.
Source:
https://scmp.com/magazines/style/watches/article/2128250/lange-sohne-launches-first-mechanical-split-seconds Watches
A Lange & Söhne launches the first mechanical split-seconds chronograph in the world
The Triple Split can be used to record the times of two competitors in hours, minutes and seconds
The power reserve of The Triple Split is up to 55 hours when fully wound.
When A Lange & Söhne launches a chronograph, it’s never just another chronograph. Its new launch, unveiled at SIHH, today is called The Triple Split – the first mechanical split-seconds chronograph in the world that allows multi-hour comparative time measurements. The additional rattrapante hands on the minute and hour totalisers make it possible to stop lap and reference times of events that last as long as 12 hours. 
The Triple Split can be used to record the times of two competitors in hours, minutes and seconds. 
The Triple Split features the new L132.1 calibre, which has 567 movement parts.
The Triple Split has broken the house record of its Double Split circa 2005 which allowed the first comparative measurements with an aggregate duration of 30 minutes. 
The 43.2mm-diameter white gold case is perfectly elegant and easy to wear.
The new L132.1 calibre boasts 567 movement parts. The power reserve is up to 55 hours when fully wound. Despite its powerful functions, the 43.2mm-diameter white gold case is perfectly elegant and easy to wear. The series is limited to 100 pieces.