![]() ![]() Some may have a connector for external sensors, allowing the stopwatch to be triggered by external events, thus measuring elapsed time far more accurately than is possible by pressing the buttons with one's finger. ![]() Because they contain a microchip, they often include date and time-of-day functions as well. Mechanical stopwatches are powered by a mainspring, which must be wound up by turning the knurled knob at the top of the stopwatch.ĭigital electronic stopwatches are available which, due to their crystal oscillator timing element, are much more accurate than mechanical timepieces. Pressing the split button a second time allows the watch to resume display of total time. When the split time button is pressed while the watch is running it allows the elapsed time to that point to be read, but the watch mechanism continues running to record total elapsed time. The second button is also used to record split times or lap times. A press of the second button then resets the stopwatch to zero. Pressing the top button starts the timer running, and pressing the button a second time stops it, leaving the elapsed time displayed. The timing functions are traditionally controlled by two buttons on the case. In fully automatic time, both starting and stopping are triggered automatically, by sensors. In manual timing, the clock is started and stopped by a person pressing a button. ![]() The text below the image shows the time that corresponds to the movement of the indicator around the stopwatch.Ī stopwatch is a timepiece designed to measure the amount of time that elapses between its activation and deactivation.Ī large digital version of a stopwatch designed for viewing at a distance, as in a sports stadium, is called a stop clock. A mechanical stopwatch Sped-up stopwatch animation. For the UK civil rights organisation, see StopWatch. ![]()
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