You can leave it as is. Both sides of the chestpiece have tunable diaphragms which allow you to hear low- or high-frequency sounds simply by adjusting the pressure on your chestpiece (see video here for more). The smaller diaphragm is designed for use with pediatric or very thin patients.
If you only see adult patients and prefer to use an open bell, you can remove the smaller tunable diaphragm and install the nonchill bell sleeve for your patients’ comfort.
Authentic Littmann stethoscopes have a serial number engraved on the chestpiece. If your 3M™ Littmann® stethoscope does not have a serial number, or you have difficulty locating the serial number, please contact us through our online form for further assistance.
We recommend that you purchase your 3M™ Littmann® Stethoscope from one of our authorised distributors to ensure that you qualify for warranty coverage and after sales service.
The Master Cardiology stethoscope is considered the top-of-the-line model for acoustic performance. However, the Cardiology IV stethoscope comes very close. The biggest difference lies with the chestpiece. The Master Cardiology stethoscope has a single-sided chestpiece for use on adults. Many cardiologists use this stethoscope.
The Cardiology IV has a double-sided chestpiece (large side for adults and small side for pediatric or thin patients). A clinician that sees patients of all ages might prefer the Cardiology IV stethoscope because of that. Also, the pediatric side of its chestpiece converts to an open bell, so if you want the option of having an open bell, the Cardiology IV stethoscope is recommended.