The noise level is usually measured to check the sound insulation in the apartment after finishing, repairing, replacing windows or doors, as well as in conflict situations when neighbors are too loud to sort things out, listen to music or use construction tools.

Noise measurement with a smartphone
When you need to take measurements, but buying a professional sound level meter seems expensive, regular smartphone apps come to the rescue. They read sound from a microphone and show a graph in decibels. The better the receiving device, the more accurate the results. In general, the method fully justifies itself as a means of obtaining introductory information, which can then be confirmed by a real sound level meter.