Clamp ammeters are traditionally used in electrical engineering applications associated with non-invasive measurements of electrical currents. Such devices infer the current based on the measurement of the magnetic field that it generates. Ammeters based on coil sensors are restrict to the measurement of alternating currents. However, there are commercial versions able of measuring direct currents, based on Hall effect sensors. This manuscript presents a prototype of a contactless ammeter based on commercial giant magnetoresistance magnetometers, able to measure alternating and direct electrical currents and to infer the distance between the sensor and the electrical current conductor.