Stopwatches

Time 1, 2 or many things at once.
A, B, and so on mark times for sports or other events.

images/stopwatch.js

The "Exactly 5" Challenge!

Can you start the stopwatch and stop it at exactly 05:000? It's much harder than it seems because of your brain's reaction time.

Laps and Splits

When timing a race, we often want to record times for different parts of the run without stopping the main clock: