iFixit Manta Driver Kit 112 Bit Driver Kit Aluminum Precision

Outstanding acoustics with better audibility of high-frequency sounds (adult side, firm pressure) Littman stethoscope is preferred by many professionals around the world
Stethoscope by Littman features tuneable diaphragm: hear high or low frequency sounds by slightly adjusting pressure on the chestpiece
Two sound paths in one tube eliminates the rubbing noise of traditional double tubes, Littman stethoscope is worth the money

Anatomically designed headset, Angled eartubes align with ear canals
Two-in-one tube design (dual lumen) eliminates noise from two tubes rubbing together
Pressure-based sound frequency adjustment with tunable diaphragm