Stresses highly accurate timekeeping, often used for navigation or scientific purposes.

Precision Instrument

While 'chronometer' can refer to watches, it broadly denotes any precise timekeeping device.

Not Just Watches

Commonly found in technical or professional contexts, not everyday conversation.

Technical Usage

 And of course, he wins most of the competitions that he enters. And we know he's the fastest on earth because we have a chronometer to measure his speed. Well, what is interesting about him is that when he wins,

Chronometer