If anyone taught chemistry well at school knows that the air itself consists of nitrogen, and in the workshops, nitrogeners produce up to 96% of nitrogen. As you can see, there is practically no difference. Moreover, checking the percentage of nitrogen in a miracle device is simply impossible. It never occurred to anyone to carry a Testo gas analyzer in the glove compartment. And so they are deceiving merchants of gullible citizens, selling ordinary air under the guise of nitrogen. And what will happen if you download pure nitrogen in car tires?