A hanging device includes a retractable post and a leg assembly including a short leg and two long legs fixed to a lower end of the post. The sensor is operative to generate a plurality of different output signals corresponding to respective positions of the sensor relative to a reference plane. Each active zone is surrounded by inputoutput pads. In still another embodiment, the computer is configured to determine a melting temperature of inclusions within the refined steel, and to determine whether this melting temperature is within an acceptable range to successfully process the steel in a continuous steel strip casting apparatusprocess, or whether the steel must be reworked to achieve an acceptable inclusion melting temperature. The spool braking unit electrically controls the spool braking unit according to the first and second operating positions. One known relationship between one reference centroid and the centroid of one eye spot is identified.