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The term chronograph is often confused with the term chronometer. Where "Chronograph" refers to the function of a watch, chronometer is a measure of how well a given mechanical timepiece performs: in order to be labeled a chronometer the timepiece must be certified by the COSC, the official Swiss Chronometer testing institute, [20] after ...
A mechanical chronometer is a spring-driven escapement timekeeper, like a watch, but its parts are more massively built. Changes in the elasticity of the balance spring caused by variations in temperature are compensated for by devices built into it.
Mechanical watches can be first COSC ISO 3159 "Chronometer" certified and after that METAS N001 "Master Chronometer" certified when all the relevant requirements are met. The first mechanical watches that met the METAS Certified Master Chronometer requirements featured Omega 8900 series automatic movements.
A chronograph is a watch with an added duration timer, often a stopwatch complication (as explained above), while a chronometer watch is a timepiece that has met an industry-standard test for performance under pre-defined conditions: a chronometer is a high quality mechanical or a thermo-compensated movement that has been tested and certified ...
Only approximately 0.2% of the Swiss made quartz watches are chronometer-certified by the COSC. [15] These COSC chronometer-certified movements can be used as marine chronometers to determine longitude by means of celestial navigation. [16] [17] [18]
Chronograph, with a second hand that can be stopped and started to function as a stopwatch. Double chronograph or rattrapante, multiple second hands for split-second, lap timing or timing multiple events; Flyback chronograph, allowing rapid reset of the chronograph as it is running; Counter chronograph; Independent second-hand chronograph
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