There are so many electronic products in modern society and magnetic field is everywhere, so when you wear your watch, you should be careful everywhere. Because many components of the watch are steel and very easy to be magnetized by outer H-field. It will cause the discrepancy to the watch and influence the accuracy once the watch is magnetized. The watch will maybe go faster or slower, the most serious situation is the springs got adhered, and in that case, your watch will go faster more than 2hs everyday. Besides that, the H-field will attract more iron filings, increase the wear of the ball bearings and influence the winding efficiency.
The influence on the quartz watch is smaller, the quartz watch will stop working when it is exposed to the external H-field at most and the magnetized components won't influence the timing performance. Once the quartz watch is out of the H-field, the watch will back to normal immediately. But in the strong Ac magnetic field, such as the huge electric motor or the potential transformer, you should notice that the quartz watch may will go very fast.
The intensity of the external magnetic field is related to the magnetic thing's Magnetic intensity itself and the contact distance. The shorter of the distance and the stronger of the magnetic intensity will make the watch magnetized more seriously. The influence of the Ac magnetic field on the watch is commutative magnetization and demagnetization, so the Dc magnetic field has bigger influence on the watch.
Actually, the influence of the eletronic products is not bigger than that of the magnetic snap of the bags, which is made from Fd-Fe-B.The watch will be magnetized immediately when your watch touch it, and the remanent magnetism will influence the timing performance constantly.
Of course, all electrical appliances are also has the magnetism, such as the mobile phones, televisions, tape recorder, computer and so on, so your watch will be magnetized very easily. Then how to know that your watch is magnetized? Here is a simple way, Put a sensitive compass flat on the table, hold your watch and do quick back and forth action above the compass, if the hand oscillated, then your watch is magnetized.
The watch is magnetized directionally, only in one position the magnetized watch will influence the compass obviously.So, when you check your watch in this way, you need to change your watch in different orientations to do the experiment repeatedly.
There is stepping motor rotor inside of the quartz watch, which is made of magnetic steel. If it's the quartz watch to do the test, the hand of the compass will
oscillate too. But there is no residual magnetism in the quartz watch, so you don't need to degauss the quartz watch.
The watch can be degaussed easily, so if you want to demagnetize your watch, you can ask the technician of the watch repair shop for help. But asked the technician to do a full range of demagnetization to the watch.
In the last, hope everyone a healthy watch 
