Certifications and standards! COSC certification is one of the most common. To earn it, a movement has to run within -4 to 6 seconds per day, tested in multiple positions and temperatures. Then there’s METAS, which sets a higher benchmark. Beyond COSC-level accuracy, METAS-certified watches are tested after they’re fully cased up, not just the raw movement. They face exposure to magnetic fields up to 15,000 gauss, extremes in water resistance, their power reserve is tested to ensure it meets the