How to demagnetize a watch [Myths and urban legends of the demagnetizer] 

Today I will explain how a demagnetizer works and on what physical principles it is based, in order to deny some practices that can end our magnetized watch or that we waste time trying to achieve optimal demagnetization and we end up blaming the device for malfunctioning.
I have been a little forced to make this video, because the comments I write on other colleagues' forums are being silenced. And it is not possible for me to correct these practices that from the point of view of physics are either erroneous or simply absurd. Although it can also be said that not everyone does the same.
In the video I will reproduce these practices, but I will not show videos of the channels in which they are broadcast, because anyone who stands in front of a camera to disclose the hobby of watchmaking deserves all my respects.
Finally, recognize that the theory of physical principles on which demagnetization is based are somewhat thick. In this case, tell them that you can skip them or if you find them interesting and something you don't quite understand, there is always the forum to ask me anything that is not clear in the video.