A magnetic reader for identifying an object includes a hardware processor, a memory storing multiple magnetic field profiles, and a magnetic field detector. The hardware processor of the magnetic reader is configured to detect, using the magnetic field detector, a magnetic field produced by one or more elements incorporated into the object, and to measure, using the magnetic field detector, one or more characteristics of the magnetic field. The hardware processor of the magnetic reader is further configured to compare the one or more characteristics of the magnetic field to one or more of the multiple magnetic field profiles stored in the memory, and to identify the object based on the comparison.