 This paper proposes a novel EEG-based system designed to measure operator concentration levels and alert them when their attention begins to wander. In order to assess the effectiveness of the system, field tests were conducted using a prototype system. The results showed that the system was able to accurately detect decreased concentration levels and provide timely warnings to the operator. Additionally, the visualization application proved useful in providing real-time feedback on the operator's concentration levels. This article was authored by Jersey Agoda, Mariusz Waskzynski, Bartosz Polnik, and others.