The group's principal activities are to design, manufacture and market production metrology and inspection systems. The group operates through three segments: ade semiconductor systems group, ade phase shift and ade technologies. The semiconductor systems segment manufactures and markets metrology and inspection systems to the semiconductor wafer and device manufacturing industries. The phase shift segment manufactures and markets high performance, non-contact surface metrology equipment using advanced interferometric technology that provides enhanced yield management to the data storage, semiconductor and optics industries. The technologies segment manufactures and markets high precision magnetic characterization and non-contact dimensional metrology gauging systems primarily for the data storage industry.