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A timer is used to measure time and etc and it is used mainly in running races and etc
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A timer is a specialized type of clock used for measuring specific time intervals. Timer can be categorized into two main types. Timer which counts upward from zero for measuring elapsed time is often called a stopwatch. Then, a device which counts down from a specified time interval is more usually called a timer .A simple example of this type is an hourglass. Working method timer have two main groups :Hardware and software timers.
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