The accuracy of traditional mechanical watches is relative. For example, to Rolex , for example, almost as the world's most accurate mechanical watch, the daily error is about 2 seconds. This is basically the error of a month of cheap quartz movement. Therefore, the accuracy of mechanical watches do not need to be compared with the television station at seven o'clock every night. There are many factors that affect the accuracy of traditional mechanical watches: magnetic field, severe turbulence, the state of lubricant in the movement, the wear and tear of the movement parts, and the waterproof failure. Common judgments, if the mechanical watch suddenly go too fast, 90% is caused by the magnetic. Demagnetization can be, cheap or free. If the daily error of the mechanical watch is more than 10 seconds, it is recommended to go to a professional or official maintenance organization for routine maintenance (also known as "wash oil"). Mechanical watch wash oil prices and the price of the table is directly related to the official maintenance of Rolex about 3000 yuan, Patek Philippe in 8500 yuan. Before maintenance, please identify the maintenance organization's maintenance qualification. Routine maintenance of mechanical watches is usually recommended every five years. If the watch is purchased that appears worse than 10 seconds slower, you need immediate care. Cause of this situation may be due to watch the watch shop in the table for too long, spotlights burn led to excessive dry oil.