Hierarchy classification:

1. top of the aat hierarchies
2. Objects Facet
3. Furnishings and Equipment (hierarchy name)
4. Measuring Devices (hierarchy name)
5. measuring devices (instruments)
6. [measuring devices for forces]
7. elemental forces measuring devices
8. magnetism measuring devices
9. magnetometers

Anotations

Scope note:

A kind of magnetometer used in aerial surveys consisting of one or more high-magnetic-permeability cores surrounded by primary and secondary windings. The signal picked up by the latter represents the direction and magnitude of the external magnetic field.