to measure time
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used for something about time
You could use a stopwatch.
There are many things about a stopwatch that you can measure.You might want to know the mass, weight, diameter, thickness,temperature, conductivity, or cost of the stopwatch, and they allhave different units.Of course, the stopwatch itself measures time, and the unit of THATis the second, in both SI and US Customary units.
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clock, stopwatch, watch