Chronograph
/ˈkrɑːnəɡræf/
Definition 1 of 2
Pro Tip 1/3Accuracy Emphasized
A chronograph highlights precision in measuring small time intervals. 
They used a chronograph for timing each segment of the science experiment.
Pro Tip 2/3Sporting Events
Commonly used in sports to measure lap times or race durations accurately. 
The coach held a chronograph to clock the swimmers' 100-meter dash.
Pro Tip 3/3Not Just Watches
Chronographs can be standalone devices, not necessarily part of a watch. 
The laboratory's chronograph recorded reaction times down to the millisecond.
Compare with
StopwatchTimekeeperTimepieceTimerWatchWristwatch
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