To the best of my knowledge, this doesn't exist, but why?
Why can't someone make a watch with a shot timer in it?
Think about it. Being able to practice IDPA stages by yourself.
They have watches that tell temp- why not have one that you hit a button, there is a delay, then a beep, then a sensor that records shots like a shooting timer?
Who should I call to get this done? Casio will laugh. Any other ideas?
(Fistful, I know you are going to reply "Ghostbusters")