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I watched the video review of the Chinese version of Elma's demagnetizer and I am skeptical about the use of a compass to measure magnetism. To measure magnetism I use a metal detector app on my iPhone. There are many such apps and they generally work well. The problem with using a compass is that they are not very sensitive while the apps detect the slightest trace of magnetism. -
I have the big blue one on the video, the one he is reviewing, and I agree that it does a great job. I purchased sone large non-horology type (but still good quality) screwdrivers 3mm, 5mm, 7mm and so on for clockmaking that were deliberately sold as magnetized ie it was factory applied and sold as a feature. I used my demagnetizer and with one click I saw the screwdriver jump and re-orientate itself slightly on the plate and sure enough they were no longer magnetized.
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I have the Elma demagnetiser and it works well enough for watch movements. However, it's not powerful enough to demagnetise tools such as hand levers. At least my copy isn't. These days I use a Greiner Magnomatic which I was lucky to get used for just about £100. It works really well with anything which fits in it.
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Clickspring as a video review of the chinese demagnetizer.
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