For the perfect measurement of the time that passes in certain activities there is a key device called a stopwatch . Its precision allows you to determine how much time has elapsed in a specific period up to fractions of a second. Due to this distinctive feature, the stopwatch is mandatory for sporting, military, naval and scientific events. Let's see how a timer works: The Quick Count The stopwatch is essential on those occasions when measurements of very small fractions of time are necessary , which cannot be detected with such accuracy through the use of a conventional watch. Stopwatches have the ability to measure not only the hours, minutes, and seconds of an activity, but they can cover fractions as short as thousandths of a second. Pushing the Button In the market, there are chronometers that measure both the full time spent on an activity and those that can divide it into several periods and present specific readings for each one, together with the...