watchionary

A rattrapante split-seconds chronograph is a type of watch that can measure intermediate times or ‘split times’, using two second hands. One hand can be stopped independently while the other continues to run, allowing the wearer to measure the elapsed time with regard to two events that start and stop at different times. This function is activated by a button or a lever on the side of the watch case. It is often used to time multiple, simultaneous events or a series of events, such as laps in a race.