The dual-frequency, “tunable” diaphragm allows the user to listen to both low and high frequency sounds by simply alternating pressure on the chestpiece. Firm pressure allows the user to hear high frequency sounds. Ease off to light “skin contact” and the diaphragm lets you hear low frequency sounds (previously heard using the traditional bell).
Images/The MGH Hair and Skin Care Center
The General Store
at Yawkey
