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            Reasonable Expectation of Accuracy from a Watch

            Reasonable Accuracy Expectations by
            Watch Type
            **
            Worst 
                         Typical
                              Best 
                        Best
                        Accuracy
            Modern quartz watch chronometer  
            certified (rare movement)  
            + / -0.02
                        + / -0.02
                        + / -0.0
                              99.9999%
            Modern mechanical watch non-certified
            + / -10
                  + / -5
                  + / -2
                        99.9942%
            Modern mechanical watch chronometer
            certified
            +6 / -4
                  + / -3
                  + / -1
                        99.9977%
            Modern quartz watch  non-certified 
            (normal movement)
            + / -2
                  + / -1
                  + / -0.1
                        99.9998%
            Vintage mechanical watch in good repair 
            + / -60
                  + / -15
                  + / -5
                        99.9826%

             

            *Seconds gain / lose per day

            **For reference purpose only & result may differ among brands

             


            Updated: 08 Jun 2017 04:48 PM
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