This atomic clock is ideal for recording the receiving of samples, noting the exact time an event occurred, providing supporting documentation for procedures, serving as a standard for a location’s other clocks and maintaining ISO 9000 certification. It receives a direct signal from the N.I.S.T. atomic clock (accurate to one hundred billionth of a second) in Boulder, Colorado and automatically adjusts for a.m./p.m., 24-hour time, day/date, daylight saving time, leap year and leap seconds. It also displays the temperature and operates on one AA battery (included). Clock is backlit to permit viewing in total darkness and its alarm increases in volume until turned off. LCD digits are ½ in.-high. To assure accuracy, an individually serial-numbered Traceable® certificate is provided from an ISO/IEC 17025 calibration laboratory accredited by A2LA. It indicates traceability to N.I.S.T. standards.