A monitoring device includes a sensor module disposed between an aeroshell and a cavity member. A surface of the aeroshell and a surface of the cavity assembly may form a flow-facing surface of the monitoring device. A junction area on the flow-facing surface within which the aeroshell abuts the cavity assembly may be a smooth surface to minimize the disruption to the surrounding flow of fluid. The sensor module may sample the absolute pressure from ports distributed about the flow-facing surface. The absolute pressure measurements may be used to compute the velocity of the fluid flow, including speed and/or direction. The monitoring device may be powered by inductively received energy or harvested energy. In one variant of the monitoring device, the monitoring device may be constructed from an electrically coupled mosaic of flexible thin-profile tiles, each of which may be responsible for one functional aspect of the monitoring device.