Official Omega statement

What are the precision tolerances for an Omega chronometer?

To earn the title of chronometer, the mechanical movement’s average daily variation in rate must be between -4/+6 seconds per day, or a precision of 99.99%, the highest precision attainable by a mechanical movement.

The precision of a mechanical movement depends on the individual habits of the wearer and can therefore vary. A qualified Omega watchmaker can adjust the precision of a watch to within the Omega tolerances, which are from -1 to +6 seconds per day.

What are the precision tolerances for other Omega mechanical watches?

The majority of watches that do not have a chronometer certificate have average precision tolerances of between -1/+11 seconds per day.

The precision of a mechanical movement depends on the individual habits of the wearer and can therefore vary. A qualified Omega watchmaker can adjust the precision of a watch to within the Omega tolerances.

What are the precision tolerances for Omega quartz watches?

All Omega quartz movements are produced in accordance with Omega’s highly renowned procedures and quality standards. Ambient temperature may affect the precision of quartz movements, which can lead to variations of between -0.5 and +0.7 seconds per day.