A hybrid domain wall Hall cross device consists of a semiconductor Hall cross having a top surface and a pair of arms intersecting at a center region, and a ferromagnetic wire fabricated on the top surface, electrically isolated from the Hall cross, and having a constriction proximate to the center of the Hall cross. The method including first and second polishing operations. A second seal ring is adjacent to the first seal ring and on an inner side of the semiconductor chip than the first seal ring. In yet another embodiment, external tubing string sensors are used to determine properties of fluid from a zone into a tubing string, independent of flow into the tubing string of fluid produced from any upstream zone. The stored energy is necessary to propagate the powered system from the initial stage to the handling stage upon the occurrence of an anomaly in the powered system. The system includes a computer processor configured to receive an encoded conditional branch instruction in a form of machine code executable directly by the computer processor, and implement the encoded conditional branch instruction unconditionally, based on underlying hardware architecture of the computer processor.