Billingsley Aerospace & Defense is a manufacturer specializing in fluxgate magnetic instrumentation for military, aerospace, geophysical, and laboratory industries. They design and produce ultra high-reliability fluxgate magnetometers, gradiometers, and Helmholtz Coil systems, focusing on sensor sensitivity, stability, and low noise performance. The company's laboratory in Brookeville, Maryland, offers state-of-the-art facilities for precise magnetic measurements, assembly, and characterization of magnetic sensors. Additionally, they provide custom instrument or system design, onsite setup and calibration services, testing facility rental, and environmental testing. BA&D is involved in collaborative research projects with institutions like IBM's Watson Research Center and the Czech Technical University in Prague, pushing the boundaries of fluxgate mechanism advancements.