Question

A watch or clock that measures time precisely ​

Answer 1

A watch is a clock that measures time precisely. If I had to choose it would be a watch.

Step-by-step explanation:

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Answer 2

A chronometer is an exceptionally precise mechanical timepiece, designed to be accurate in all conditions of temperature, pressure, etc, especially one used at sea. Watches are sometimes distinguished from clocks in general, but really a watch is just a portable clock, usually worn in a pocket or on the wrist.