Such method of auscultation is used for A) The correlation of the Korotkoffs sound with the first heart sound B) This stethoscope is used for other purposes also for examples - 1) For comparing the intensity of the second heart sound at the pulmonary area and at the apex or mitral area 2) For comparing the intensity of the murmur at the aortic area and at the mitral area 3) For comparing the air entry at the same areas of the right and left lung as well as at the different areas of the auscultation of the same lung.