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Magnets marketed for pain relief usually claim strengths of 300 to 5,000 Gâmany times stronger than the Earthâs magnetic field (about 0.5 G) but much weaker than the magnets used for MRI machines (approximately 15,000 G or higher).
Types Edit. Magnetometers can be divided into two basic types: 1  Scalar magnetometers measure the total strength of the magnetic field to which they are subjected, and. 2  Vector magnetometers have the capability to measure the component of the magnetic field in a particular direction.ne type of magnetometer is the proton precession magnetometer, also known as the proton magnetometer, which measures the resonance frequency of protons (hydrogen nuclei) in the magnetic field to be measured, due to Nuclear Magnetic Resonance (NMR).