Magnetism can be measured by using a device called a magnetometer. There are different types of magnetometers such as fluxgate, proton precession, and SQUID (superconducting quantum interference device) magnetometers. These devices are capable of detecting the strength and polarity of magnetic fields. They work by detecting the tiny fluctuations in the magnetic field caused by the presence of magnetic materials or charged particles. The results of the measurements can be used to determine the intensity and direction of the magnetic field, and the properties of the magnetic material or particles being studied.
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