The SprayExplorer PDA receiver is designed to enhance particle size and velocity measurements in a wide range of applications while simplifying the setup and use. To this end, the SprayExplorer PDA receiver includes a large aperture front lens and software controlled selection of masks and spatial filters together with integrated photodetectors supporting particle size and up to 3 velocity components. Optimal alignment of the SprayExplorer PDA receiver is easy thanks to a built-in camera and illumination system. The high resolution camera is focused on the slit which is illuminated by an LED allowing the user to easily find the ideal focus and position of the measurement volume during alignment. The camera image is streamed to the computer for real-time feedback during the alignment procedure.