A stopwatch is a handheld timepiece designed to measure the amount of time elapsed from a particular time when activated to when the piece is deactivated. A large digital version of a stopwatch designed for viewing at a distance, as in a sports stadium, is called a stopclock.
Mechanical stopwatches are powered by a mainspring, which must be periodically wound up by turning the knurled knob at the top of the watch.
Digital electronic stopwatches are available which, due to their crystal oscillator timing element, are more accurate than mechanical timepieces. Because they contain a microchip, they often include date and time-of-day functions as well.
Some affordable Stopwatches for Sale
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