All functions and applications of TY-28MJ hand-held needle detector, detection of iron (foreign iron matters such as needle tips and iron scraps) and nonferrous metals (foreign metal matters such as copper pin and stainless steel), wide application fields and range not limited to garments, textiles, food, medicines, jewelry, safety inspection, geology, mineral or the like industries, and use by managerial personnel in workshop for sampling and improving needle detection consciousness and the deterrent force of the managerial personnel.