Inside it, the screwdriver is exposed to an opposite magnetic field, but with a twist. The stepped layout of a demagnetizer, if you've seen one, is designed to create an irregular magnetic field. It randomly spins the magnetic moments. As a result, any magnetic field the tool exhibits will disappear.

How does a magnetizing machine work?

Magnetization is to magnetize a magnetic substance or to increase the magnetic properties of a magnet having insufficient magnetic properties. The working principle of magnetizing machine (magnetizing power supply): ... The peak value of the discharge pulse current is very high, reaching tens of thousands of amps.

How long does a Magnetizer last?

The screwdriver should stay magnetized for at least three months; accidentally dropping it will weaken it sooner by throwing the magnetic elements out of whack.