The new clock is so reliable that it would be off by less than a second if it had started running 100 million years ago, ...

【Upgraded Big Screen Display】- Experience the luxury of a 5.5" High Resolution Digital Alarm Clock that spells out the time, date, and temperature clearly. The illuminated LED digits ensure ...

Atomic Wall Clocks Battery Operated with Alarm - This digital calendar alarm ... work well for work, study or travel schedule.

With access to a 10-MHz timebase from a cesium fountain atomic clock — no less a clock than the one that’s used to define the SI second, by the way — [Daniel] looked for ways to sync the ...

The National Institute of Standards and Technology's new cesium fountain clock is one of the most precise atomic clocks ever ...