An electrical device for regulating photoperiod, fan, etc., a timer is a must in all cultivation operations.
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A timer or countdown timer is a type of clock that starts from a specified time duration and stops upon reaching 00:00. It can also usually be stopped manually before the whole duration has elapsed. 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. Stopwatches operate in the opposite direction, upwards from 00:00, measuring elapsed time since a given time instant. Time switches are timers that control an electric switch.

English
Pronunciation
- (General American) IPA(key): /ˈtaɪmɚ/
- Rhymes: -aɪmə(ɹ)
Etymology 1
From time (verb) + -er.
Noun
timer (plural timers)
- Agent noun of time: someone or something that times.
- A device used to measure amounts of time.
- Synonym: timepiece
- Any electronic function that causes a device to be able to do something automatically after a preset amount of time.
- A person who records the time elapsed in a sporting event.
- Synonym: timekeeper
- A device used to measure amounts of time.