In Belgium, the inspection of sprayers is performed by official and mobile teams ruled by two inspection authorities. The management of the inspection is done by the Federal Ministry for Consumer Protection, Public Health and the Environment (FAVV). In the Flemish region the inspection is delegated to the Institute for Agricultural and Fisheries Research (ILVO). In Belgium, the mandatory inspection of sprayers was started up in 1996 and the 6th inspection cycle (2011-2012-2013) is currently running. In the past decade the number of sprayers equipped with a spray rate controller, increased significantly. In the first inspection cycle (1996-1997-1998), only 4.58% of the sprayers were equipped with a spray rate controller in Flanders. In the fifth inspection cycle (2008-2009-2010), this percentage increased significantly to 20.37%.As the original inspection method for spray rate controllers showed some lacks and was time consuming, ILVO developed a simple and reliable method for testing rate controllers used on field and orchard sprayers.