"Metal Tester" is an application that works with metal sensors that are inserted into the 3.5 mm audio port of mobile phones and analyzes alloys according to the composition: "ferrous / non-ferrous metals".The application allows both absolute measurement (AR mode, values from 0 to 32768) and relative to user-defined values of various metals, ferrous and non-ferrous (basic mode, values from 0 to 100%).