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My CE timer has a "par" function. You set the time you want to beat/match, wait for the initial beep (which can have a random delay), then complete your presentation / dry fire before the second beep.
https://www.midwayusa.com/product/1810132542/competition-electronics-pocket-pro-2-shot-timer
https://www.midwayusa.com/product/1810132542/competition-electronics-pocket-pro-2-shot-timer