Analog Atomic Wall Clock Automatically Adjusts to DST
Always accurate Analog Atomic Wall Clock runs on AA batteries for approximately two years before needing replacement. Accurate to 1/10,000 of a second. A controlling radio signal from NIST in Boulder, Colorado automatically adjusts to precise time, daylight savings, leap year, and leap seconds (corrections for the earth's rotational "wobble"). Features a bright, highly visible second hand. Measures 12" dia. x 1-1/4"D. Weighs 1.4 lbs. Includes wall mount, screw, a single AA battery and a certificate of traceability to NISTstandards.