Chronometer：Observatory Watch

" Observatory Watch (Chronometer) ", which is when you watch high-level contacts will encounter a word . Many people feel inscrutable face of this title , and even directly from the literal meaning : those who have been called the " chronometer " watch should be the world's major Observatory scientists wear extremely accurate travel time professional with a watch , even with some Function of the reach of ordinary people . In actual fact, in the field of watches , diving watch , air watch, car watch , etc. is really to divers , aircraft pilots , driver development to meet their special needs of watches , these watches in a waterproof , anti-magnetic , strong sex and time functions Has a unique design , and " chronometer " but with those large telescopes have no connection whatsoever with the unit.
Observatory watch with a slightly specialized vocabulary - " Observatory certification " this is the thing, and a Swiss watch factory specifically for the detection of the major official organizations of the clock accuracy , the acronym for the COSC.

Observatory to obtain certification , every movement must be in the COSC 16 days of 24 hours to accept three kinds of temperature and 5 positions of the test . Testing and evaluation of the project include: the average daily speed, average speed of change, the maximum speed changes, the speed difference in different locations , the biggest difference in speed , temperature values , sustained speed of 7 .

Stringent testing by the agency 's watch movement that is " chronometer movement , " and can be marked on the dial to the glory of "Chronometer" words , the watch boxes are a beautiful certificate. More is now in the form of sampling that is representative of each of a batch by a qualified ; in the history of rigorous testing and, moreover, often organized COSC precision race walking . Early years , the Patek Philippe (Patek Philippe) has won many awards in this competition .

But to know that as long as the daily error of mechanical watches +4 ~ -6 seconds in between the compliance , because of its 99.99% accuracy consistent with the norms . Like a Rolex (Rolex) can form on the watch is usually poor control in two seconds , is the world's one of the most accurate mechanical watch , so an accurate chronometer mechanical movement is relative, if the demanding accuracy of the watch , Quartz or atomic clocks, many times stronger than the mechanical watch , but also lose the great charm of the mechanical.