4D Technology Corp., based in Tucson, Ariz., has opened an East Coast sales and support office in East Hampton, Conn., to be managed by Don Roberts, who has also held sales/support positions at KLA-Tencor, ADE Phase Shift and Zygo Corp. 4D makes optical metrology instruments for the astronomy, aerospace, data storage and semiconductor industries. The phone number for the new office is (860) 365-0420.