This is a chess clock -
You set each side to half the allotted time of the match.
When your turn at the table is over you hit your side to stop your clock and start your opponents.
Take as long as you want on a particular shot, it's up to you to budget your allotted match time. If someone runs out of time, you lose the match.
Seems to me like these solve all tournament scheduling problems, and they're about 20 bucks, price of a cue ball.
Why aren't they used in pool touraments?

You set each side to half the allotted time of the match.
When your turn at the table is over you hit your side to stop your clock and start your opponents.
Take as long as you want on a particular shot, it's up to you to budget your allotted match time. If someone runs out of time, you lose the match.
Seems to me like these solve all tournament scheduling problems, and they're about 20 bucks, price of a cue ball.
Why aren't they used in pool touraments?