It might sound like a contradictiona lightweight cardiology stethoscope. But it doesnt stop there. It has a classic Sprague Rappaport-like dual acoustic output, but with an innovative X-configuration dual lumen tube construction that eliminates the rubbing that can cause acoustic interference. The MDF Cardio-X Stethoscope delivers accurate auscultation of heart, lung, and Korotkoff sounds with acoustic integrity and clarity. An ergonomic design ensures comfort for the doctor and patient, even during extended use. Precisely handcrafted, the MDF Cardio-X revolutionizes high-performance stethoscopes and is quite simply the ultimate in auditory diagnostics with unmatched performance and durability. Chestpiece: The handcrafted light-weight aluminum dual-head chestpiece is precisely machined and hand polished for the highest performance and durability. A dual-output, full-rotation acoustic valve stem with green indicator dot allows the user to easily identify the active sound channel. The chestpiece is fitted with an ultrasensitive diaphragm sealed with a non-chill retaining ring to provide a secure acoustic transmission of heart and lung sounds of 100Hz to 1000Hz. The extra large bell, crowned with a non-chill bell ring, provides greater sound amplification and isolation of low frequencies (20Hz to100 Hz). Acoustic Tubing: Constructed of latex-free PVC, the 2-in-1 X-configuration non-stick acoustic tubing maintains two uninterrupted sound transmission channels to preserve acoustic integrity while sealing out extraneous sounds, even in high-noise conditions. The thicker, denser PVC construction prevents cracking and wearing that can occur from repeated use. AccuFit Headset: Adjustable headset constructed from chrome-plated brass allows the user to create an individualized fit. Soft ComfortSeal eartips are clear for hygienic purposes and conform to the ear to seal out extraneous noise while ensuring comfort during extended use. Force-fit, non-threaded SafetyLock eartip adaptors lead the industry in user safety. Included Accessories: 2 extra sets ComfortSeal eartips, spare ultrasensitive diaphragm, and ID tag. Warranty and Service: Lifetime warranty (5 years on tubing); Free Replacement Parts for Life Program.