Technology for testing a target recognition, analysis, and tracking system is provided. The first portion includes a first pin that to engages the material at a first location on the material. Intermediate nodes on the OBP are transient nodes and simply forward traffic optically. The memory device comprises a plurality of memory cells, an access transistor gate being connected to a word line and a memory transistor gate being connected to a write line. The accuracy of these flow meters can be improved by providing additional transducers to measure the current speed of sound of a working fluid; the actual spacing of the probes; and the diameter of the pipe through which the fluid is flowing.