What is a chronometer? What is a chronograph?
These two terms are commonly confused among new watch aficionados. They actually have very little to do with each other. A chronometer is a watch which has passed a test given by the Contrôle Officiel Suisse des Chronometres, or COSC. The COSC is an official Swiss government agency which tests watches to ensure that they fit within a narrow-but-usually-obtainable window of acceptable error (i.e., the rate in all positions falls into the range of -4 seconds/day to +6 seconds/day). While some watch companies tout their products as having a COSC certificate, it really is not that difficult to pass the test, and over 95% of the watches submitted pass. Another factor to consider is that the COSC does not test watches as they are sold in the store, but movements fitted with a temporary case, dial and hands. In addition, the COSC certificate cannot say anything about how the movement was handled after testing. For more information on COSC testing and the meaning of the results reported on the
These two terms are commonly confused among new watch aficionados. They actually have very little to do with each other. A chronometer is a watch which has passed a test given by the Contrôle Officiel Suisse des Chronometres, or COSC. The COSC is an official Swiss government agency which tests watches to ensure that they fit within a narrow-but-usually-obtainable window of acceptable error (i.e., the rate in all positions falls into the range of -4 seconds/day to +6 seconds/day). While some watch companies tout their products as having a COSC certificate, it really is not that difficult to pass the test, and over 95% of the watches submitted pass. Another factor to consider is that the COSC does not test watches as they are sold in the store, but movements fitted with a temporary case, dial and hands. In addition, the COSC certificate cannot say anything about how the movement was handled after testing. Several watch manufacturers actually put more stringent tests than the COSC procedu
