Watch Error Standard

Industry standards for watch quality (error):
  At present, China does not have a national standard for the quality of watches and clocks, and the industry standard formulated in 1991 is now implemented.
  For the time error of clocks, the current line standard stipulates:
  The instantaneous error range of the calendar mechanical watch type I (men’s watch) is:
  Top-grade products have an error of -30 to +45 seconds every 24 hours;
  The first-class product has an error of -40 to +75 seconds every 24 hours;
  The error of qualified products is -60 ~ + 105 seconds every 24 hours.
  Continued travel time is greater than or equal to 36 hours.
  Calendar mechanical watch type II (medium-sized watch) instantaneous error range of travel time is:
  Top-grade products have an error of -35 to +65 seconds every 24 hours;
  The first-class product has an error of -50 ~ + 95 seconds every 24 hours;
  The instantaneous error range of qualified products is within the range of -70 to +135 seconds per 24 hours.
  The extended travel time is 35 hours or more.
  The instantaneous error range of the calendar mechanical watch III (Kun watch) is:
  Top-grade products have an error of -40 to +85 seconds every 24 hours;
  The first-class product has an error of -60 to +115 seconds every 24 hours;
  The error of qualified products is -80 ~ + 165 seconds every 24 hours.
  Continued travel time is greater than or equal to 34 hours.

  The instantaneous error range of the automatic mechanical watch type I (men’s watch) is:
  Top-grade products have an error of -20 to +30 seconds every 24 hours;
  The first-class product has an error of -30 ~ + 60 seconds every 24 hours;
  The error of qualified products is -50 ~ + 90 seconds every 24 hours.
  Continued travel time is greater than or equal to 36 hours.
  The instantaneous error range of the automatic mechanical watch type II (medium-sized watch) is:
  Top-grade products have an error of -25 to +50 seconds every 24 hours;
  The first-class product has an error of -40 to +80 seconds every 24 hours;
  The error of qualified products is -60 ~ + 120 seconds every 24 hours.
  The extended travel time is 30 hours or more.
  The instantaneous error range of automatic mechanical watch III (Kun watch) is:
  Top-grade products have an error of -30 to +70 seconds every 24 hours; First-grade products have an error of -30 to +100 seconds every 24 hours;
  Qualified products have an error of -70 to +150 seconds every 24 hours.
  The extended travel time is 28 hours or more.
  Quartz watch regardless of the model, the instantaneous error range when traveling is:
  Top quality error every 24-hours-0.5 ~ + 0.5 seconds;
  First-class product error every 24 hours-1.0 ~ + 1.0 seconds;
  The error of qualified products every 24-hours is -1.5 to +1.5 seconds.
  From the above standards, it can be seen that the quartz watch has higher travel accuracy due to electronic control, while the mechanical watch travels on the principle of mechanical swing, so its travel accuracy is relatively poor. In addition, the larger the mechanical watch, the higher the accuracy of the travel time. Conversely, the smaller the mechanical watch, the lower the accuracy. Therefore, when buying a watch, you should choose it according to your personal preferences. People who have high requirements for time accuracy and don’t wear it often should choose quartz watches. Generally, mechanical watches have better shock resistance and waterproof ability, and the best choice for this demand Mechanical watch.