A circuitry for counting drips and monitoring a rate of infusion is incorporated into an IV administration set. The slave transparent latch comprises dedicated functional data and scan data output ports. The computer vision algorithms may minimize an energy function that represents the relationships and similarities among features of the two-dimensional images to assign pixels of the two dimensional images to planes in the three dimensional scene. A control unit of the system provides operates to cause a user interface display to communicate information to a user based on the positions of the different hand pieces.