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Anonymous Wed Aug 22 22:31:37 2018 No.13621462 [View]
File: 138 KB, 600x615, casio waveceptor radio range.png [View same] [iqdb] [saucenao] [google]

>>13621457
unless you're talking about the very small number of watches with actual atomic clocks, atomic/radio are the same, they sync to radio waves broadcast from laboratories with atomic clocks.

The alternative is a GPS watch, which gets its time signal from GPS satellites, rather than earth-based radio. They work anywhere in the world, not just in range of the 5 atomic radio stations.

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