In manual timing, the clock is started and stopped by a person pressing a button.In fully automatic time, both starting and stopping are triggered automatically, by sensors.

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When trying to figure out if changes that you’ve made are beneficial, or not, it’s incredibly difficult to have the times constantly shifting by 15 – 60ms every page reload.

Both of these cases set me out to do some investigating.

A stopwatch is a handheld timepiece designed to measure the amount of time elapsed from a particular time when it is activated to the time when the piece is deactivated.

A large digital version of a stopwatch designed for viewing at a distance, as in a sports stadium, is called a stopclock.

Mechanical stopwatches are powered by a mainspring, which must be periodically wound up by turning the knurled knob at the top of the watch.

Digital electronic stopwatches are available which, due to their crystal oscillator timing element, are much more accurate than mechanical timepieces.The timing functions are traditionally controlled by two buttons on the case.Pressing the top button starts the timer running, and pressing the button a second time stops it, leaving the elapsed time displayed.Stopwatches that count by 1/100 of a second are commonly mistaken as counting milliseconds, rather than centiseconds.The first digital timer used in organized sports was the Digitimer, developed by Cox Electronic Systems, Inc. It utilized a Nixie-tube readout and provided a resolution of 1/1000 second. The device is used when time periods must be measured precisely and with a minimum of complications.A press of the second button then resets the stopwatch to zero.