Nose breathing testing device

A device for testing nasal breathing comprises a series-connected breathing mask 1, a sensor 2 of the difference in air flow pressure and a mouthpiece 3. Sensors 5, 6 measure the difference in air flow pressure. The check valve 4, sensors 5, 6 and the sensor 7 air flow are connected to the air vent mask 1, the outputs of the sensors 2, 5, 6 and the air flow sensor 7 are respectively connected to the first, second, third and fourth inputs of the analog-to-digital converter 8, the first output and fifth input of which are connected respectively with PC input and output 9. The PC performs data analysis to determine the relationship between the pressure difference at the entrance to the nasal passages and the pressure in the oral cavity during the cycle of inspiration.