Who manufactures fluxgate gradiometers?

Fluxgate gradiometers are manufactured by several companies, including Geospace Technologies, Zonge International, and Scintrex. These devices are primarily used in geophysical surveys, mineral exploration, and environmental monitoring. Each manufacturer may offer different models and specifications tailored to various applications in the field. Additionally, some academic institutions and research organizations also develop custom fluxgate gradiometers for specific research purposes.