Stopwatch
From the Simple English Wikipedia, the free encyclopedia that anyone can change
A stopwatch is a tool used to measure the amount of time something takes. For example, to learn how soon a car can reach 60 miles per hour, or how much time it takes a runner to run 40 yards. Nowadays, stopwatches are even installed in digital watches. You press a button to start the time and press it again to stop the time. The time is displayed on the screen of it. It even tellls you the millisecond!