Casio Wave Ceptor

Cheap Casio watchesCasio became well known for the wide variety and innovation of its wristwatches. It was one of the earliest manufacturers of quartz crystal watches, both digital and analog.
The Casio Wave Ceptor is a line of radio watches by Casio. Wave Ceptor watches are able to calibrate themselves to the correct time by receiving time signals from various government time services around the world. These signals are normally driven directly by ultra-accurate atomic clocks, and so by synchronizing with the signals, the Wave Ceptor watches achieve long-term accuracy - the same accuracy as the atomic clocks that drive the time signals, which is on the order of one second in three million years.

Some affordable Casio Wave Ceptor Watches