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Related Terms — Certification
Accuracy Certificate
Official document certifying watch meets specified precision standards.
C.O.S.C. Certificate
Official document proving watch movement meets chronometer precision standards
Chronometer Rating
Official COSC certification grade indicating movement precision within specific tolerances
Chronometer Standard
Set of rigorous testing criteria ensuring exceptional timekeeping precision.
Chronometric Accuracy
Degree to which watch maintains precise and consistent timekeeping.
COSC
Contrôle Officiel Suisse des Chronomètres - Swiss official chronometer testing institute
COSC Tolerance
Chronometer standard: -4 to +6 seconds per day maximum variation.
Cosmic Ray Testing
Extreme altitude testing verifying chronometer performance stability