3M Littmann Lightweight ll S.E. Stethoscope. This Littmann stethoscope Features a newly designed chest piece on the Littmann Lightweight ll S.E. Stethoscope for better orientation around blood-pressure cuffs and body contours. The tunable diaphragm assures acoustic sensitivity and conveniently alternatives between high and low frequency sounds. Special Lightweight construction allows for extra comfort and portability. Length: 28"/71 cm