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 would raise an alarm when it ends. It can be implemented as 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.

This article is about the type of clock. For the 2009 film, see Timer (film). For the cartoon character, see Time for Timer.
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