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The stopwatch is a handheld clock, which is used to measure the duration of an event or two events, the elapsed time between. It is used for timing, for example in laboratory experiments and in several sports such as sprint. The stopwatch displays elapsed time up to hundredths of a second precision parts, and the longest measured online timer time may be an hour or more in length. Working principle of stop-watches are mechanical or digital (quartz) at devices that are equipped with a stop-and-start function and digital versions often with different interval times the memory functions.

Also, many digital wristwatches can be found in the online stopwatch function, as it is among other things a number of mobile phones.