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Three refers to the watch waterproof, antimagnetic, and shockproof.
Because we can not live without water, waterproof is particularly important. After contact with the movement, such as water vapor, dust, chemical corrosive gas, will rust due to dirt and lead to oil volatilization, thus affecting travel time and long-term stability. Therefore, watches must have a certain waterproof performance, most modern watches can do this.
When the watch is placed in the external magnetic field, the magnetic influence will make the watch go fast and slow changes or even stop. When the watch is occasionally in a magnetic field of 4800A/m, the residual effect of quartz watch does not exceed 1.5 seconds, the residual effect of the mechanical male watch (movement area is greater than 314 square mm) does not exceed 30 seconds, and the residual effect of mechanical female watch does not exceed 45 seconds. Choose an antimagnetic watch, to avoid the impact of the external magnetic field, to avoid the travel time error phenomenon is very important.
In daily life, work, the watch will inevitably be impacted, collision or accidentally fell on the ground, at this time, the table machine in the weak parts such as the tip of the pendulum shaft may be broken, some parts may be deformed or damaged. When the watch accidentally falls from a height of 1 meter to the horizontal hardwood surface, the residual effect of the quartz watch does not exceed 2 seconds, the residual effect of the mechanical watch does not exceed 60 seconds. Therefore, the watch must take certain anti-shock measures to protect the watch.