stopwatch

Suiting action to word, he took up his stopwatch and set the needle swinging.
The Skylark of Space|Edward Elmer Smith and Lee Hawkins Garby
I don't think I can answer that question accurately, because the time approximation, without a stopwatch, would be difficult.
Warren Commission (6 of 26): Hearings Vol. VI (of 15)|The President's Commission on the Assassination of President Kennedy
Do you remember offhand what the stopwatch timed us at—I think we did it twice, is that correct?
Warren Commission (3 of 26): Hearings Vol. III (of 15)|The President's Commission on the Assassination of President Kennedy
Did we make any or do any stopwatch tests about any route from the southeast corner of the sixth floor down to the lunchroom?
Warren Commission (3 of 26): Hearings Vol. III (of 15)|The President's Commission on the Assassination of President Kennedy

You saw the stopwatch on all of these timing occasions when it was started and when it was stopped, is that correct?
Warren Commission (3 of 26): Hearings Vol. III (of 15)|The President's Commission on the Assassination of President Kennedy

British Dictionary definitions for stopwatch

stopwatch

/ (ˈstɒpˌwɒtʃ) /

noun

a type of watch used for timing events, such as sporting events, accurately, having a device for stopping the hand or hands instantly

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

stopwatch

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British Dictionary definitions for stopwatch