fluxgate - a device consisting of one or more soft iron cores surrounded by coils, used for determining the characteristics of an external magnetic field
"Magnetometers" using "superconductive", optically pumped, nuclear precession (proton/Overhauser) or triaxial fluxgate "technology" having a "noise level" (sensitivity) lower (better) than 0.05 nT rms per square root Hz;
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