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clock is type of measuring device that you can use to see the time
just by measuring it by 12 inches every time- chidimma agbugba
Time is the independent variable.
With a stopwatch or a shotclock.
In the past, a common time measuring instrument was the sundial. Today, the usual measuring instruments for time are clocks and watches. For highly accurate measurement of time an atomic clock is used. Stop watches are also used to measure time in some sports.