I am actually timing it with 3 things... (1) My ipad stopwatch app, (2) an App that supposedly uses atomic clock and (3) my iphone stopwatch app.... granted, all three are electronics. I'll try with the quartz as you suggested. Now where did I put my seiko...
BTW, would there be any situation, based on your experience and knowledge, that would cause a watch to appear normal under the timegrapher but in actual fact has an issue? Or is it like the 'final authority' on accuracy?
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