Timer
Type of clock / From Wikipedia, the free encyclopedia
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This article is about the type of clock. For the 2009 film, see Timer (film). For the cartoon character, see Time for Timer.
A timer or countdown timer is a type of clock that starts from a specified time duration and stops when reaching zero. A simple timer is an hourglass. Commonly, a timer triggers an alarm when it ends. A timer can be implemented through hardware or software. Stopwatches operate in the opposite direction, upwards from zero, measuring elapsed time since a given time instant. Time switches are timers that control an electric switch.
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