Stopwatch [http://expect.nist.gov/stopwatch] is an easy-to-use Tk script that enables hand timing much like a physical stopwatch. It can also be used as a countdown timer. Stopwatch has millisecond precision, syncs with the system clock for accuracy, and has no artificial limit on hours - for practical purposes, its limit is plus and minus 25 years. Stopwatch runs on UNIX, Windows, and MacOS.

[http://expect.nist.gov/stopwatch/stopwatch.gif]

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See also:

   * [A little stopwatch]
   * [iLogWatch]
   * [timers]