Online stopwatch countdown timer

The stopwatch can be divided into the hanging wall (stopwatch), Wrist strap (watch), insert pocket stopwatch, also known as mandarin results. In addition, it is also associated with other devices such as computers, landline and mobile ...
Purpose

Wall stopwatch timer are used in homes and offices, wristwatch was taken in hand, the large stopwatchs are placed in public places (churches or bus). Most computers and mobile phones are the lower display now.

However, the stopwatch is not always used to display the time. It also can be used to control an object over time. For example, the stopwatch bell can be used as a ticking time bomb. However it can be more accurately referred to as a system timer.

The clock is a tool to measure the time period of less than a day; opposed to the calendar, is a tool to measure longer than a day. The clock used in engineering often have very high accuracy and very complex structure. Meanwhile, one can make small clocks to easily take with you (called a wristwatch). The modern clock (from the 14th century onwards) often show three information: hours, minutes, seconds.

Computer using the online stopwatch signal to synchronize the process (although there is some research on asynchronous processors). Computer storage time to signal or just to display the time. Inside the computer has a stopwatch fed by the battery. The computer can still work even if the stopwatch on your death but upon reboot, the computer's stopwatch will be restarted.

Time is a fundamental concept in physics. Therefore, fabrication instrumentation exact time is important in experiments.
In explorer

In the exploration industry, especially by boat, people need to have the correct tools to measure longitude and latitude. Longitude can be measured by astronomers in latitude must have a very precise stopwatch. John Harrison was the first to manufacture the first watches with very high precision in the mid-18th century. In Cape Town, people are still shooting performance to the ship can adjust the correct time for your stopwatch.

At (lat. cloca) is a device intended to measure the time. Smaller watches, such as wrist watches, the action is usually included. In public places is usually a larger, solid watches. Also, computers and mobile phones are at. The clock function is not always only displays the time, such as a VCR, and time switch clockwork task is to guide the device to operate at a given time. The time can also be given impulses.
Modern Watches

The core part of the quartz stopwatch was invented in the 1920 decade.

Electronic stopwatch was invented in 1956.