## 4 Conclusions  
Validation of the results obtained by the proposed measurement method with the results obtained on the groove table indicates the possibility of using an innovative test method. The research conducted should be carried out in a controlled laboratory environment. The study shows that for a reduced value of measurement time from T = 120 s to T = 10 s, and thus a decrease in the number of measured droplets in successive trials, the spread of the median volume value for the group of nozzles tested did not exceed 11.2 \(\upmu\)m. The smallest differences in the relative values of the volumetric median were observed from 185,000 drops measured in the liquid stream during testing (results not exceeding 3 \(\upmu\)m were obtained). In the case of measuring the volumetric diameters of Dv0.9 and Dv0.1, small changes in their values were also observed over the entire range of test times (from T = 120 s to T = 10 s), and so for Dv0.9, the maximum spread of values was 13.9 \(\upmu\)m, while for Dv0.1, the maximum spread of values was 5.3 \(\upmu\)m. The results obtained from the point measurement made in the center axis of the jet may be subject to error (recommendations according to ISO/FDIS 25358:2018--a minimum of five measurement points determined at the depth of the jet); nevertheless, an attempt was made to conduct tests and verify them. The two measurement methods used different representative volume measurements (sampling method and significantly different amounts of liquid analyzed); nevertheless, the preservation of regularity in assessing the nature of volume distribution was observed. The method and the results obtained can be successfully applied to nozzle assemblies on a virtual boom in the context of stream assessments from the area of full coverage. It is possible to use the procedure developed in future studies to evaluate the volume distribution determined for a virtual spray boom equipped with a group of different nozzles of the same type and conducting diagnostic evaluations of the proper functioning of spray nozzles placed on the boom. Based on the analysis of the results obtained in the three stages of testing in terms of assessments of micro and macro parameter variability, for nozzle testing it is recommended to use a minimum measurement time of T = 60 s at each discrete measurement point of the liquid jet. For micro-parameter analysis and transverse volume distribution for a single nozzle, the measurement time can be limited to T = 20 s (for fine droplet nozzles--Tejet 11001, MMA 1103). However, when assembling the results of transverse volume distribution on the virtual boom for the criterion (CV factor, number of cylinders out of tolerance), the fulfillment is possible for time T = 60 s. Calculated and imposed volumes in these areas result in contractual cylinders out of tolerance \(\pm\)15%. The analysis of the results obtained in the three stages of testing clearly indicates that the minimum value of measured droplets for complete evaluation is a value of about 185,000 in the spray stream.  
Methodology, D.L. and M.K.; Data curation, D.L. and M.K.; Writing--review & editing, D.L. and M.K. All authors have read and agreed to the published version of the manuscript. This research received no external funding.  
Not applicable.  
The original contributions presented in this study are included in the article. Further inquiries can be directed to the corresponding author.  
The authors declare no conflict of interest.