How to identify the authenticity of 304 stainless steel security door

Updated on Security door 2024-01-27
1 answers
  1. Anonymous users2024-01-23

    Generally, there are two ways to use a strong magnet to suction, with a little or no suction. This depends on the suction of your magnet, and the most accurate one is the potion solution plus direct current color changing method. You can buy this kind of stainless steel, which is generally about ten yuan, and it is 9 yuan on my side, and then use a small battery and a little wire.

    How to use it depends on the manual you bought, and the coloring tested corresponds to the corresponding material.

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