Our atomic watches are accurate to 1.5 seconds every thousand years in full atomic mode. In low power mode, they are accurate to approximately 1 second per hundred years.
Our Hoptroff watches are also world-beating, accurate to 1 second per year.
Our Hotblack watches are accurate to 15 seconds per year. To achieve this, each watch is individually individually trimmed and thermally compensated using temperature calibration curves obtained from a batch of watches.