Stopwatch

A stopwatch is a special kind of clock that is used to measure time in a specific way. It has two main buttons that you can press to control it. One of these buttons is called the "start" button, and the other one is called the "stop" button. When you press the start button, the stopwatch will begin to count the time that has passed. When you press the stop button, the stopwatch will stop counting the time.

For example, if you were racing your friends to see who could run the fastest, you would use a stopwatch to time how long it takes each person to finish. If you press the start button when the race begins, the stopwatch will start counting the time. When the first person finishes the race, you press the stop button, and the stopwatch will stop counting the time. Then you can write down how long it took the first person to finish the race.

Stopwatches can be very accurate and are used in many different ways. They are used in sports, engineering, cooking, and many other fields where accurate timing is important. Some stopwatches can even measure time to the thousandth of a second!