A chronograph is no ordinary watch. As well as telling the time to an extremely high degree of accuracy, chronographs are also finely engineered with complicated functions that can calculate your average speed, measure your heart rate or keep track of two events simultaneously. They’ve also played a starring role in scientific history, from their invention by Louis Moinet in 1816 for tracking astronomical objects, to accompanying Jacques Cousteau in his exploratory deep-sea dives (that chronograph was the Omega Seamaster Diver 300, to be precise). What’s more, a chronograph is a serious piece of conversation-starting kit for your wrist. Here’s the best new ones to hit the watch world recently.