Abstract: The invention relates to a nozzle adjustment aid (A) for a liquid spray nozzle (B) for the testing, positioning and/or adjusting of at least one nozzle (B) for spraying operations in surface engineering plants, in which the nozzle adjustment aid (A) has a nozzle adapter (F) and at least two positioned and aligned light sources (H, M) with sharp concentration and/or with focusing, by means of which at least two light beams (J, P) can be generated approximately along the nozzle central line and/or approximately along at least one boundary line at the boundary of the theoretical spray area (C) or approximately along at least two preferably oppositely situated boundary lines, which light beams are substantially intended to indicate the position and size of the theoretical spray area (C).