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ISO 10553:2018
Horology - Procedure for evaluating the accuracy of quartz watches
This document specifies the procedure for evaluating the accuracy of quartz watches, individually and by lots (see Annex A which presents the methods for statistical evaluation of accuracy by lot), and the relationship between the accuracy tested and the accuracy classification given by the manufacturer.
It applies to quartz watches having accompanying documents on which the accuracy classification is indicated.
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International Organization for Standardization [iso]
