Chronometer Master Chronometer is a term used to describe a watch that has been certified by the Swiss Federal Institute of Metrology (METAS) for meeting the highest standards of accuracy and performance. These watches are tested for accuracy, anti-magnetism, water resistance, and power reserve. They have to pass 8 tests, including a test for accuracy after exposure to a magnetic field of 15,000 gauss. This certification is a sign of a watch’s quality and craftsmanship.
