Continuous needle detectors can be used to detect hidden needles in different types of sewing products (such as men, women, children, underwear, kimono, coats, beds, shoes and hats, plush toys , carpets, sanitary products). Broken needles and other iron pieces, etc., can also be used to detect toilet materials such as medicine, food (food, fish, meat, fruit, etc.), zipper of clothing accessories. , button, and non-magnetic Materials such as copper, aluminum, zinc, paper, rubber, chemical industry materials, etc. are mixed with iron pieces.