Both the double- and triple-head Harvey DLX stethoscopes are specifically designed to accentuate important sounds and enable you to hear cardiac, pulmonary, and vascular sounds without relying on difficult "variable pressure" techniques. The Harvey DLX is equipped with dual-bore tubing that creates two uninterrupted sound channels and works with the optimally weighted brass chestpieces to transmit a full range of physical sounds. Providing clear, crisp sound, the Harvey DLX helps enhance your auscultation capabilities.