Watch Marketing And Maintenance » chronometer

Jaeger-LeCoultre's 1,000-Hour Control is one of the most rigorous watch quality standards in the industry — stricter than COSC chronometer certification. Learn how it works and why it matters.

The term "chronometer" is one of the most misused words in watchmaking. You'll see it printed on dials from budget fashion brands to Swiss maisons — but what does it actually mean, and what does it take to earn it officially? The Correct Definition "Chronometer" is a colloquial term. The precise technical designation, as defined by international standard ISO 3159, is: "a precision watch...