This document describes the design of a device to directly measure wall shear stress in blood vessels. It consists of a central floating member surrounded by 8 cantilever beams with strain gauges. As fluid flows through the member, a shear force is applied and strains the beams. Key components are described along with the methodology used to optimize dimensions. Testing showed the device could successfully measure shear stress values comparable to theoretical predictions using different fluids and flow rates. While it approximates ideal conditions, this prototype demonstrates the ability for a relatively inexpensive system to directly measure wall shear stress.