A modern approach to active learning is a technique called “learning by do-ing”. It is usually the most wanted approach. As an example of this technique, this paper presents a student learning process about sensors and their prop-erties by performing experiments and learning from sensors’ manuals. In or-der to compare distance sensors in industry applications, an experiment was conducted. Experimental results leads to conclusion which of the available sensors showed the most accurate results in relation to the results given by the manufacturer. Finally, conclusions have been made about reasons for the deviation of individual sensors from the predicted values.