GEM - Vector Magnetometers Brochure

The dIdD Suspended Magnetometer for accurately measuring the changing Declination and Inclination of the Earth’s Field. In the past, magnetic observatories relied on a combination of Overhauser, fluxgate and theodolite instruments for obtaining measurements. GEM then introduced the dIdD (delta Inclination/delta Declination) system for high precision results.  Next, dIdD was  enhanced significantly with the development of the Suspended dIdD system.