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Title: Six part per million accuracy
Review: I have had this Casio watch for two days and have been comparing it to National Time Clock time from the National Institute of Science and Technology and the Naval Observatory. In two days it has not lost or gained a second, so its accuracy is 1/172800 (86400 seconds in a day). That is less than 6 parts per million, which makes it one of the most accurate watches available. My Bulova 98H51 holds 3 parts per million but costs about 12 times as much as the Casio.At less than $10, the Casio is probably the world's best example of mass produced accuracy in any measuring device, especially one that works over a wide range of temperatures, positions, and accelerations. It is a magnificent achievement.
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