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A typical kitchen timer. A timer or countdown timer is a type of clock that starts from a specified time duration and stops upon reaching 00:00. 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.
The stopwatch function is also present as an additional function of many electronic devices such as wristwatches, cell phones, portable music players, and computers. Humans are prone to make mistakes every time they use one. Normally, humans will take about 180–200 milliseconds to detect and respond to visual stimulus. [2]
An Egyptian method of determining the time during the night, used from at least 600 BC, was a type of plumb-line called a merkhet. A north–south meridian was created using two merkhets aligned with Polaris, the north pole star. The time was determined by observing particular stars as they crossed the meridian. [24]
Metric time is the measure of time intervals using the metric system. The modern SI system defines the second as the base unit of time, and forms multiples and submultiples with metric prefixes such as kiloseconds and milliseconds. Other units of time – minute, hour, and day – are accepted for use with SI, but are not part of it
Windows Clock (known as Clock & Alarms on Pocket PC 2000, [2] Alarms on Windows 8.1, and, until July 2022, Alarms & Clock on Windows 10) is a time management app for Microsoft Windows, with five key features: alarms, world clocks, timers, a stopwatch, and focus sessions. The features are listed on a sidebar.
The first stopwatch with a built-in spare parts compartment for quick repairs (1943) The first chronograph wristwatch with additional 24-hour GMT hand (Gallet MultiChron Navigator, 1945) [29] The first "waterproof" stopwatch (Gallet Yachting Timer, 1945) The first 24-hour reading wrist chronograph (Gallet MultiChron 24HR, 1947)