20 1 1 can the metal detector find out whether there are warm stickers for the postgraduate entrance examination? Metal products are not allowed in the examination room instructions. What about the zi

20 1 1 can the metal detector find out whether there are warm stickers for the postgraduate entrance examination? Metal products are not allowed in the examination room instructions. What about the zipper on the jeans? Question 1: The metal detector can't find out whether the examinee has posted a warm sticker.

Question 2: It should be said that things are prohibited, such as mobile phones, walkie-talkies, MP3 players, calculators, etc.

As for your depression, you will understand when I explain the metal detector to you. To put it bluntly, metal detectors detect by magnetic induction. We all call it an emergency door, and its signal can be adjusted, which is what we call sensitivity. Some small metals such as zippers and belts can be eliminated by reducing the sensitivity to a certain extent. In particular, there seems to be iron powder in the warm treasure you mentioned, and the amount of iron powder is too small, which we can basically ignore. Security doors are now used with hand-held metal detectors. When you pass the security door, which part will call the police, he can check it with a hand-held metal detector. For example, jeans that people like to wear now have big metal zippers on them, which is no problem.