FullScreen Stopwatch
start stop resume Lap
Options: days 
hrs min
reset display
Timer size: + -
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You can launch 
MonkeyTimer Stopwatch in a small window.
(drag the " Rocket icon / Launch StopWatch" link / bookmarklet to your browser bar to launch a stopwatch from anywhere.)
This full screen stopwatch is great when you need to show a timer using a computer attached to an overhead projector. Adjust the timer size settings to make the numbers larger or smaller to suit your display needs.