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The stethoscope kit with components for the 3M Littmann Cardiology III contains a black ring and an adjustable diaphragm for each side of the breastpiece (adults and children). The kit also includes a pair of black, soft earplugs.
Convenience through the 'adjustable technology' of 3M in the large membrane (adults) and in the smaller membrane (pediatric). Thanks to adjustable technology, you can hear high and low frequency sounds by simply applying a light or hard pressure to the chestpiece