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Reminds me of the first atomic clock wristwatch:

http://leapsecond.com/pages/atomic-bill/

> Batteries are included (they last about 45 minutes but are rechargeable)

Supposedly, that retails for about $30,000.

Depending on your tolerance for accuracy, rubidium standards are much cheaper and smaller. Obviously the second is defined in terms of cesium, so if you really want to be the reference clock for your entire country, you're going to need to shell out the cash for a cesium standard. But if you merely want to be within a nanosecond per day, rubidium is fine for that.

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