Chronometer

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Term Main definition
Chronometer

In terms of accuracy, it’s normal for mechanical watches to deviate between 10 to 20 seconds, out of 86,400 seconds in a day. Watches that bear the label “COSC certified chronometer” means the movement has passed COSC standard for accuracy, deviating within -4/+6 seconds a day. Digital watches generally deviate by a second a day, or less.