In testing many teams run these large aero rakes, these are large arrays of pressure sensors used for aerodynamic testing. 
The rake is made up of an array of Kiel probes mounted to a large aluminium frame. They measure stagnation pressure, the probe is like a simple pitot tube with a shroud around it.
Each probe has a plastic tube running back to a pressure sensor mounted downstream on the car. This results in a large pod housing all the electronics.
By mounting the probes in this array, the pressure that they measure can be mapped and compared to CFD or wind tunnel data, which visually looks like a low resolution version of this CFD image.
These probes are commonly 3D printed using laser melted aluminium. Despite the slightly rough surface finish, this is the perfect means to manufacture these, as there is no airflow through the tube, only pressure.
