What do “chronometer” and “chronograph” mean?
Chronometer is a designation given to a watch that has the highest standard of precision. The designation is given to automatic and mechanical movement watches, not those that run with quartz movement. A watch carrying the chronometer certification has passed vigorous tests demanded by the Swiss Official Chronometer Control (COSC). A chronometer’s mechanical movement is close to perfection, so the time it displays is almost always accurate (unlike other self-winding or automatic watches), and therefore carries a premium price over non-chronometer watches. The 15 days of rigorous tests conducted by the COSC include testing its performance under different temperatures, different positions, and even under water. A chronograph designation is often confused with a chronometer one, though they are completely different. A chronograph is basically a watch with stopwatch capabilities. It displays different counters or mechanisms for measuring elapsed time. Counters can register seconds, minutes
