Ideal for both magnetizing and demagnetizing metal or steel tools, especially screwdrivers. Simply place the metal or steel portion of the tool you would like to magnetize into the "+" slot and turn it clockwise several times. Once you are ready to demagnetize your tool simply place the steel or metal portion into the "-" slot and rotate it several times. This ability allows you to make tasks, like grabbing small metal fasteners, easier while still allowing you to reuse the same tool (once demagnetized) on electronics. The compact design of the Magnetizer / DeMagnetizer makes it easy to store and transport.