Equipment for magnetizing, demagnetizing, illumination, metering and monitoring are also described.

The method includes the step of applying a substantially uniform electromagnetic field to a magnetized object under condition to substantially demagnetize said object.

Others go so far as to require the part be demagnetized and cleaned prior to applying the procedure again.

Hc : With the value of the coercive excitation (Hc), we can know what is the intensity of the opposite magnetic field necessary to completely demagnetize.

Hysteresis Loop - A plot of magnetizing force versus resultant magnetization (also called a B/H curve) of the material as it is successively magnetized to saturation, demagnetized, magnetized in the opposite direction and finally remagnetized.