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  2. Stopwatch - Wikipedia

    en.wikipedia.org/wiki/Stopwatch

    The timing functions are traditionally controlled by two buttons on the case. Pressing the top button starts the timer running, and pressing the button a second time stops it, leaving the elapsed time displayed. A press of the second button then resets the stopwatch to zero. The second button is also used to record split times or lap times ...

  3. Timer - Wikipedia

    en.wikipedia.org/wiki/Timer

    A typical kitchen timer. A timer or countdown timer is a type of clock that starts from a specified time duration and stops upon reaching 00:00. An example of a simple timer is an hourglass. Commonly, a timer triggers an alarm when it ends. A timer can be implemented through hardware or software.

  4. Double chronograph - Wikipedia

    en.wikipedia.org/wiki/Double_chronograph

    Double or Rattrapante Chronograph Wristwatch (1948) - manufactured by the Gallet Watch Company in La Chaux-de-Fonds, Switzerland.. The Double chronograph, also known as a split-seconds chronograph, is a watch that includes two distinct stopwatch mechanisms in order to measure two separate events concurrently and/or comparatively.

  5. Clock - Wikipedia

    en.wikipedia.org/wiki/Clock

    An analog pendulum clock made around 18th century. A clock or chronometer is a device that measures and displays time.The clock is one of the oldest human inventions, meeting the need to measure intervals of time shorter than the natural units such as the day, the lunar month, and the year.

  6. Time switch - Wikipedia

    en.wikipedia.org/wiki/Time_switch

    The timer may switch equipment on, off, or both, at a preset time or times, after a preset interval, or cyclically. A countdown time switch switches power, usually off, after a preset time. A cyclical timer switches equipment both on and off at preset times over a period, then repeats the cycle; the period is usually 24 hours or 7 days.

  7. 555 timer IC - Wikipedia

    en.wikipedia.org/wiki/555_timer_IC

    A second resistor in parallel, the new timing is half the table time. A second resistor in series, the new timing is double the table time. 2.5 ms (0.25x) ≅ 100 nF and 22.75 kΩ (four 91 kΩ resistors in parallel), 5 ms (0.5x) ≅ 100 nF and 45.5 kΩ (two 91 kΩ resistors in parallel), 10 ms (1x) ≅ 100 nF and 91 kΩ (values from table),

  8. Shot timer - Wikipedia

    en.wikipedia.org/wiki/Shot_timer

    A shot timer is a shot activated timer used in shooting sports, which starts the competitor by an audible signal and also records the competitor's time electronically by detecting the sound of each shot, together with the time from the start signal. When the competitor is finished, the timer will show the time from the start signal until the ...

  9. Quartz clock - Wikipedia

    en.wikipedia.org/wiki/Quartz_clock

    If a quartz movement is daily "rated" by measuring its timekeeping characteristics against a radio time signal or satellite time signal, to determine how much time the movement gained or lost between time signal receptions, and adjustments are made to the circuitry to "regulate" the timekeeping, then the corrected time will be accurate within ...

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