Buy An Atomic Wall Clock
WT-3144P Classic Atomic Wall Clock 
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WS-8117U-IT-OAK Digital Atomic Clock 
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WT-3181P Outdoor Atomic Wall Clock 
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I remember the first time that I heard about an atomic wall clock, I thought it was something nuclear. I thought maybe it was something that could sustain a nuclear blast or maybe it was designed in the event of a nuclear war. I wasn't really sure at the time, but that completely isn't the case.
This type of clock actually uses a very advanced type of technology. Traditionally old clocks would tell the time by the pendulum that swung back and forth. It actually moved at a speed similar to that of each second. Digital clocks use crystals that do oscillations at roughly and does the count. I'll spare you the technology on how all the old clocks work. The problem with them is that they're not always exact.
You've probably noticed that the clocks in your house will not hold the same time everyday. Eventually it will get slower or faster. You'll set your alarm clock at 7 in the morning and you'll wake up before the news starts and sometimes you'll wake up right in the middle of it. It's close enough, but not accurate.
An atomic wall clock is used by radio stations, television stations, investors, etc because it tells the exact time without any mistake. They are able to tell the time based on the resonant frequency of atoms. That probably sounds high tech and it is. Atoms have a pretty consistent frequency, so you don't have to worry about the time become slightly slower or faster like normal clocks.
There are a lot of different types that you can choose from, so I thought I could give you a break down of each:
Cesium: This uses a beam of cesium atoms to tell the time. Basically it separates the cesium atoms by using a magnetic field.
Hydrogen: This clock will actually maintain hydrogen atoms at a specific energy level in a container.
Rubidium: This is probably about the simplest form of this type of clock. They use a simple glass cell of rubidium gas that changes its absorption of light as the frequency of the atoms change.
This all sounds sort of complicated for an atomic wall clock, but basically all you need to know is that it is our most accurate way of telling time. If you need a clock to be very accurate than this is the way to go.
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