The pictures come from a piece of software, which can be downloaded for various testing devices from 'http://snapon-equipment.de/'. It is necessary, that the testing device, in this case an oscilloscope, constantly extracts data and saves it in a format that is understandable for the software. The consecutive presentation of the tension lying on the air-mass flow sensor, is shown as a film.
The possibility of the comparison with other data is emphasised in several pages of cartecc.com. Generally the workshop is satisfied with a multimeter measurement. Here, for educational purposes, it's quite clear, how many more possibilities there are for data-analysis, when using an oscilloscope.