Timer

A simple digital timer. The internal components—including the circuit board with control chip and LED display, a battery, and a buzzer—are visible.

A timer is a specialized type of clock for measuring time intervals. By function timers can be categorized to two main types. A timer which counts upwards from zero for measuring elapsed time is often called a stopwatch; a device which counts down from a specified time interval is more usually called a timer or a countdown timer. A simple example for this type is an hourglass. By working method timers have two main groups: Hardware and Software timers.

单词	Software timer
释义	Software timer 英语百科 Timer A timer is a specialized type of clock for measuring time intervals. By function timers can be categorized to two main types. A timer which counts upwards from zero for measuring elapsed time is often called a stopwatch; a device which counts down from a specified time interval is more usually called a timer or a countdown timer. A simple example for this type is an hourglass. By working method timers have two main groups: Hardware and Software timers.
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