Made of high-temperature resistant industrial ABS plastic/metal shielding material/epoxy resin tank seal and ultrasonic welding, it has good quality performance and is suitable for inspection of large outdoor power equipment, inspection of large iron towers and poles, inspection of large and medium-sized elevators, tray management, large pressure vessels, liquid carburetor steel cylinders, factory equipment management, line inspection, metal bridge quality inspection, tunnel inspection, machine identification, vehicle license plate, metal container management Product tracking and other aspects of various electric household equipment.