铁金属探测器：是一种磁感应式金属探测器，这种金属探测器只能检测到铁、钴、镍等可上磁性的金属，俗称检针机。检测铁精度和灵敏度较高，对纯度高的铜铝等非铁金属不检测，因此，这种金属探测器常用于安装了金属辅料（铜钮扣、铜拉链）的检测作业。
Iron metal detector: it is a kind of magnetic induction metal detector. This kind of metal detector can only detect iron, cobalt, nickel and other magnetic metals, commonly known as needle detector. The detection accuracy and sensitivity of iron is high, and it does not detect non-ferrous metals such as copper and aluminum with high purity. Therefore, this kind of metal detector is commonly used in the detection of metal accessories (copper buttons, copper zippers).