MDF® Pulse Time 2-in-1 Digital LCD Clock and Single Head Stethoscope The original MDF® Pulse Time™ Stethoscope with timing apparatus enables medical professionals to maintain eye contact with patients during diagnosis. The Pulse Time™ provides professionals with a more efficient and patient-friendly method of monitoring vital signs. (USA pat. no. 5252787 & China pat. no. 87572) This innovative, patented Pulse Time™ chestpiece is equipped with a 24-hour liquid crystal analog (LCA) quartz timepiece. The advanced chestpiece is made of lightweight anodized aluminum and fitted with a unique raised ultra-thin fiber diaphragm for greater amplification and transmission of heart and lung sounds.