[Lightsabre]

Eloomp's timer will do that for you, as well as timing you itself. another handy feature you missed Mr. Sableye, is the beeper. see that little box at the bottom of the timer with the ten next to it? if you check that box, and refresh the page, then when the timer hits 10, 9, 8, etc. it'll beep. that means you can get your hand into a rythem to improve your reaction