Mechanical watches due to the structural characteristics of the clockwork, friction between materials and the ring and fatigue, the output torque from strong to weak changes, as well as the clockwork and gears in the transmission distance generated when the friction and so on, will affect the accuracy of travel time. Then there are climatic temperature, gravity, magnetic field, regional environment and location also affect the normal operation of clockwork clock. The quartz watch now overcomes the weakness of the mechanical watch, making use of the extremely stable high-frequency vibration of quartz crystals as a benchmark of time. Quartz watch to go the time error is generally ± 0.5s (superior), mechanical watch walking time error of ± 15s / d - ± 120s / d or even greater range of some well-known brand name watches abroad for example: Jazz watches imports ( an outlet for the standard male form -25 ~ + 29s / d, the female form -30 ~ + 120s / d, 4--5 hundred waves such as class table (Pronto), Nivada (Nivada), Certina (Certina ), Enicar , Sandoz, Titus, etc. The general standards of plant and seller are less than ± 45s / d for the week and 2 ~ 3 for the plum Titoni), West Malaysia (Syma), friction pattern (Marvin), luxury (Heuer) as the less than + 30s / d, such as high-grade Rolex (Rolex), Omega (Omega), Longines (Longines) of less than ± 15s / d, Imported Japanese watches, men's watch is generally not more than ± 50s / d, female watch does not exceed ± 60s / d. The above data are for reference only. If you are accustomed to quartz watch, do not be surprised at the high error of mechanical watch, Palm incomparable, a lot of people's mechanical complex is not a substitute quartz watch, on the contrary, if you time High precision requirements, can be selected quartz watch.