1.Digital processing to received signal with advanced microcomputer, to improve detecting accuracy. 2.Has memory function, could remember twenties productions’ checking values. 3.Human-nature operation interface can be set simple and convenient. 4.Made by stainless material, high quality. 5.Conform to GMP, HACCP standard. 6.Suitable for detecting small metal materials such as iron, copper, aluminum and stainless inside production in textile, toys, foodstuff, medicine industries, etc. Can detect many type objects, such as bags, bottles, carton boxes, etc.