It is a common factor that there is often residual magnetism in iron or steel objects. Determining “how much” magnetism is remains in parts or structural elements is important and often curial for many critical components. Alloy steels, those that are heavily cold worked or heat treated, are open to retaining magnetism especially after having been exposed to strong magnetic fields such as those use in Magnetic Particle Testing (MPI) etc. Levels of residual magnetism can be instantly determined using an Annis Meter.