My Forever Replacement Brass Tweezers
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@RichardHarris123 I just look for a relative increase or decrease as it passes over the watch, not an absolute value. It it doesn't change much passing over the watch, than I conclude little or no magnetism, if I see the value jump from the background number, than I know I have a problem
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By RichardHarris123 · Posted
How accurate is it? Does it take the earths magnetic field into account, what is an acceptable reading? -
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.
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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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