Alert sound

The "white noise" alert sound is probably the worst choice for a noisy environment. Much better would be one of the telephone touch-tones sounding 2-4x/second. Some way to increment/decrement the clock by seconds (holding the + or - key, perhaps) would help when the director fails to stop the clock right after a touch. As noted by others, yellow and red card counters would help, too. Id suggest keeping only the bottom start/stop button to free up space for other features.

fencer_ref about ScoreCounter