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A magnetometer is a measuring instrument used to measure the strength and the direction of magnetic fields.

The first magnetometer wras invented by Carl Friedrich Gauss in 1833

Magnetometers can be used as metal detectors: they can detect only magnetic (ferrous) metals, but can detect such metals at a much larger depth than conventional metal detectors; they are capable of detecting large objects, such as cars, at tens of meters, while a metal detectoris rangę is rarely morę than 2 meters

Materiał sample is mounted on a movable rod this rod is moves between two coils. Firs coil is supplied wiłh altemating current and generate vibration of the coils. second coil generate current is proportinal to the magnetic moment.

This capadtor has two electrodes (plates) one of them is mounted on the surface of the rod. capitor has a variable capacity ,and this capadty is proportional to the amplitudę and freguency