What is a chronograph? This is nothing more than a special type of watch with a function that allows accurate measurement of time - commonly referred to simply as a "stopwatch". We can recognize it by an additional graduated ring and an additional pointer, which is used to indicate the measured time interval. The chronograph is operated with a single button (the so-called "pusher") - one press starts the stopwatch, the second - stops it. Another press "zeros" the result, the pointer returns to the starting position.