noun
chronometer
A precision timepiece used especially in navigation and scientific contexts. The term is a direct loan from English and is used in technical or historical discussions.
船の航海士はクロノメーターで正確な時刻を確認した。
The ship's navigator checked the exact time with the chronometer.
時計 is the general word for 'clock' or 'watch', while クロノメーター specifically refers to a high-precision timepiece used in navigation or science.
Borrowed from English 'chronometer', itself from Ancient Greek χρόνος (khrónos, 'time') + μέτρον (métron, 'measure').