Armed with these tools and a stopwatch, he performed " Water Walk, " setting off a series of sounds with a serious expression and incredible precision.
It contains the equivalent of a stopwatch telling us how many seconds elapsed, a clock counting the hours of the day, and a calendar notifying us of the seasons.
If you are running a race, for example, you will have someone typically who has a stopwatch, who turns a watch on when you start running and off when you finish.