MDF® MD One Stainless Steel Premium Dual Head Stethoscope Constructed from acoustically-superior stainless steel, the MDF® MD One™ Stethoscope delivers accurate auscultation of heart, lung, and sounds with acoustic integrity and clarity. An ergonomic design ensures comfort for the doctor and patient, even during extended use. The MD One™ is a premier diagnostic instrument with unmatched performance, durability, and aesthetics. The handcrafted stainless steel dual-head chestpiece is precisely machined and hand polished for the highest performance and durability. The full-rotation acoustic valve stem with green indicator dot allows the user to easily identify the active sound channel and seals in sound. The chestpiece is fitted with an ultrasensitive diaphragm sealed with a non-chill retaining ring to provide a secure acoustic transmission. The extra large bell, crowned with a non-chill bell ring, provides greater sound amplification, isolation of low frequencies, and patient comfort.