According to the different detection functions, it can be divided into: metal pass-through type, applied to metal target pass-through detection, with adjustable sensitivity, high detection accuracy (0.1mm diameter wire) and strong anti-interference.Metal through the dynamic detection (-n series), applied to high-speed detection of metal targets and dynamic points, sensitivity adjustable, pulse delay (adjustable 0.1-200ms), high detection accuracy (0.1mm diameter high-speed wire), strong anti-interference.High-precision metal pass type (-t series), both metal detection and counting, adjustable sensitivity, pulse delay (0.1-200ms adjustable), high detection accuracy (0.1mm diameter high-speed wire), strong anti-interference.