Regular testing of devices for the application of plant protection products (PPP) in the Republic of Slovenia has been carried out since 1995. The purpose is to identify the technical defects on the sprayers that affect the spray application itself, the quality of the PPP application and the environmental protection. Testing of sprayers is carried out in accordance with the Rules on requirements for the proper functioning of plant-protection devices and the conditions and method of carrying out their inspections (Pravilnik o zahtevah …, 2013). This document details the technical requirements that sprayers must-have, their equipment for sprayers inspections and other conditions regarding space, etc. In this diploma we analyzed the technical errors that occur on sprayers as part of regular inspections. In addition, we have identified the actual technical equipment of sprayers such as nozzles with reduced drift, an additional water tank, diaphragm anti-drip valves, etc. We also found the area of the fields that are being sprayed by the sprayer owners. There were 108 tractor sprayers inspected and analyzed.