The purpose of sprayers is primarily to protect arable land and crops. The correct and successful application of plant protection chemicals and the application of water-soluble fertilizers in foliar fertilization depends on the correctness of the sprayer itself, i.e. its working parts, and the external conditions during the use of this tractor aggregate. A correct sprayer must enable spraying under a specific or set spraying pressure, so that there is no unnecessary use of chemicals and thus pollution of the environment. The use of chemicals in crop protection contributes to increasing yields. The intensive use of them calls into question the safety of the operator and the environment in which they are used. Therefore, on February 12, 2014, the law on the sustainable use of pesticides entered into force due to the achievement of the standards prescribed by the European Union. Testing of plant protection machines in use before January 1, 2013 is performed according to the European standard EN 13790, which has been in force since 2003. The standard is divided into prEN 13790-1 which refers to field sprayers and prEN 13790-2 for atomizers. Norms contain a set of rules and guidelines for determining correctness and the way in which individual parts of the sprayer and atomizer are tested. Upon joining the European Union, Croatia had to adapt its regulations and laws and harmonize them with European ones. And so we have the Law on the Sustainable Use of Pesticides from 2014, according to which agricultural producers who own sprayers and sprayers undertake regular testing according to EN 13790 I and EN 13970 II. From this paper, we can conclude that in the Poţega-Slavonska County area, all inspected sprayers and one atomizer were satisfied with their correctness according to the above-mentioned standard. Visually, all the machines looked neat, clean and in good general condition, the pumps of all sprayers were working and dry. The transverse distribution of the liquid on all sprinklers was within the limits of the permitted deviation.