The measurement of how many seconds are gained or lost per day, week, month or year from a mechanical or electric movement. Mechanical movements are adjusted to different accuracy grades with the chronometer being the most accurate (maximum deviation of -4 to +6 seconds per day). In addition to a chronometer, there are also watches rated as Master Chronometer (see here)
Some content about what the glossary is
A small hammer and gong within a mechanical movement that?s usually set via a separate hand on the dial to sound an alarm. A separate, dedicated spring is often used for the alarm mechanism to offset its large power consumption
The measure in degrees of the balance wheel as it rotates in both directions. This back and forth swing is known as the beat with an average amplitude of 270 to 315 degrees
