Purpose <p>Characteristics and dynamics of the droplets sprayed by nozzles are among the important features to be evaluated in unmanned aerial vehicle (UAV) spraying. Numerous methods have been used to measure the spray characteristics of the fine droplets formed by the nozzles of an unmanned aerial spraying system (UASS). This article aims to explore the different laboratory methods used indoor to measure such characteristics, through examining important parameters of the droplets sprayed by different types of such nozzles.</p> Methods <p>Laboratory methods surveyed in this study include the liquid-sensitive cards, portable scanners, test systems, wind tunnels, lasers, and imaging, that are all considered conventional procedures to evaluate the spray characteristics of UASS nozzles.</p> Results <p>Using UAV simulators without the body cover is suggested to be a suitable solution for the measurement of spray characteristics of UASS nozzles. It is a simpler and cheaper option compared to the wind tunnel, while it provides the ability of moving the nozzles at different speeds.</p> Conclusions <p>With reviewing the methods mentioned in this article, it is possible to select the most appropriate method to evaluate UASS nozzles depending on the type and working conditions or available facilities in future research.</p>