By the look of it, I guess this is using a magneto-resistive sensor at its tip.
If it is confirmed, it can indeed be qualified of 'magnetometer' since it measures a magnetic field.
As the advertisement precises, it ignores the non-metallic material, which confirms my guess.
Honeywell among others is making such devices to be used in the industry in automatic systems (see the HMC series).
The magnetoresistive sensors are made of a nickel-iron (Permalloy) thin-film deposited on a silicon wafer and patterned as a resistive strip element. In the presence of a magnetic field, a change in the bridge resistive elements causes a corresponding change in voltage across the bridge outputs.
Such a sensor is much easier to integrate and adjust than the above systems.
However, its sensitivity is far from the sensitivity of the PPM or even of 'good' fluxgate systems.
The sensitivity and range of most of those devices are specified in Gauss or its modern equivalent Oersted while the specs of PPM or fluxgate systems are defined in Gamma or nano-Tesla (nT).
One Gauss is 10,000nT. For example, the best sensors of the Honeywell family give a variation of 1mV/V/Gauss. It means that a variation of 1nT would need the measurement of a variation of 10 nV.
Willy
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