Which watches are susceptible to magnetism: First of all, the antique watch with particular attention to anti-magnetic, as well as the assembly of antique movement of the table, their material is not made in accordance with modern technology, anti-magnetic performance is weak. Second, the ultra-thin form is susceptible to magnetization. Because of the small footprint of the ultra-thin movement, conventional anti-magnetic measures (such as blocking the magnetic field through a thick case) are difficult to implement. In addition, mechanical watches in modern life more and more exposure to the magnetic field, the intensity is also growing. Not to mention the impact of the accuracy of travel time, for a long time to watch in a strong magnetic environment on the movement is not small damage. In the high-end watches to mechanical movement to occupy the absolute dominance, if not even the accuracy of the operation can not be guaranteed, then any other function is only superfluous. Watch anti-magnetic basics: 1) Watch anti-magnetic specifications Japanese watches: usually do not mark anti-magnetic, marked with ordinary anti-magnetic and marked with three kinds of enhanced anti-magnetic. Non-standard anti-magnetic: can resist 1600A / m magnetic field (equivalent to 20 Gauss). Ordinary anti-magnetic (the figure is a horizontal cross below 'U' in the reverse direction): Can withstand a magnetic field of 4800A / m (equivalent to 60 Gauss). Reinforced anti-magnetic (the figure is reversed 'U' plus two horizontal): Can withstand a magnetic field of 16000A / m (equivalent to 200 Gauss). Speaking of anti-magnetic your brother, you have to mention the Rolex MILGAUSS watch, the watch with its own special rare earth Parachrom Nickel Cobalt Blue Coil, combined with almost no openings of the fully sealed antimagnetic soft iron cover, the anti-magnetic function to 100000A / m degree, called anti-magnetic watch model. 2) The magnetic field decay with distance The strength of the magnetic field is inversely proportional to the square of the distance. As the distance increases, the magnetic field strength decays sharply. Ordinary antimagnetic watch, as long as more than 5cm away from the magnet is enough security. Even if it is not marked with a magnetic watch, but also to leave a little further (10cm above) on the line. In daily life, as long as a little attention, you can avoid the dangers of the magnetic field on the watch, no need to talk about magnetic color change. 3) Example of ordinary magnet mobile phone, handset, computer, razor, radio, handbag magnetic buckle, refrigerator door, induction cooker, magnetic bracelet, magnetic pillow and so on. Mechanical watches by the magnetic hazards Mechanical watch travel time by the gossamer and balance wheel control. After the watch by the magnetic, the magnetic makes the swing frequency of the balance changes, so the speed of the gear system will change, watch go crazy. After the magnetic, the watch may stop, slow, or fast. Light symptoms, the error of tens of seconds. Severe, the daily error of several points. After the watch by the magnetic, its magnetic will not recede, the need for degaussing repair to return to normal. Diagnostic watch by the magnetic method is always suspiciously suspect that their watch is not subject to magnetic, will seriously affect the human spirit of tranquility, here to introduce a diagnostic watch by magnetic simple method: to stall to buy a compass, the watch near the compass, If the compass deflection is very powerful, then the watch is subject to magnetic. Even if the watch is not subject to magnetic, because the watch itself is made of steel, when the watch close to the compass, the compass will also be fretting, but the degree of deflection is small. This method can also be used to detect the presence of magnetic fields where the watch is stored. Take the compass to the place where the watch is stored, and if the compass is deflected, there is a suspicious magnet nearby. Iron and steel tools at home, such as pliers, are often magnetically close to magnetic objects when they are unaware. Where the watchkeeping should also be removed from such magnetic tools.