Atomic clocks are so 20th century. Get a GPS receiver; its clock will have similar precision
THats ok if you wanna hve a GPS hanging on the wall? They dont have a particularly large face unless you get a marine unit with a plotter which can cost ohhhh, about 750 and up.
Atomic clocks are now made which look just like old Seth Thomas regulator clocks.
Also- when you change the battery, all one does is to punch the 'Time zone" button and it sets itself. You shouldnt screw with it any further.