The UOS-100 consists of ultrasonic emitters, receivers, and a control interface. It is designed to significantly enhance error proofing in demanding industrial assembly applications. The unit is suitable for applications requiring assembly process assurance, such as automotive assembly where screws need to be processed in a particular order. It is also suitable for the allocation of objects in assembly line production and other quality assurance systems. Error proofing demands that one knows which work piece a fastening tool is operating on. In the past this has been accomplished by “footprinting” the operation and restricting the motion of the tool to a single footprint. Ultrasonic positioning removes this limitation resulting in higher productivity without loss of process control, and enables users to precisely determine the position of a tool or object in 3D space without the need for complex mechanical systems such as articulating arms. The UOS-100 is a complete system — from propagation time measurement to the output of the calculated x, y, and z coordinates of the object to be positioned. These coordinates can be used by a higher-level control system, with communication taking place via Ethernet, for individual workstation control. Systems can be cascaded together to allow up to 124 workstations to be networked and managed.