Herman J. Nullmeyer, 70 a financial consultant and retired comptroller of the Scope Electronics Corp. in Reston, died Tuesday at Montgomery General Hospital in Olney. He had cancer.

He came to Washington during World War II when he served as a lieutenant commander in the Navy. After the war, he returned to his native New York and worked as an assistant treasurer of the Vitro Corporation. From 1968 to 1972, he was controller of the Defense Electronics Corporation in Rockville, then served as comptroller with Scope Electronics until retiring in September 1974.

He also had been a member of the Advisory Board of Maryland National Bank. Before World War II, he had been an assistant treasurer of the National Association of Manufactures in New York City.

Mr. Nullmeyer was a graduate of New York University where he also earned a master's degree in business administration. He attended the Brooklyn Law School.

He was a Mason.

Survivors include his wife, the former Dorothea Storck, of Rockville; a daughter, Barbara Brakeley of New Canaan, Conn.; a son, William M., of Brookeville, Md.; two sisters, Harriet Nullmeyer of Brooklyn and Eleanor Duerr of Oradell, N.J.; a stepbrother, Henry Fickbohm of Nahant, Mass., and three grandchildren.