Cardionics is a manufacturer of medical electronic instruments specializing in the field of heart and lung sounds. This Texas-based corporation was founded in 1981. The officers have extensive experience in the medical field including general management, medical marketing, engineering and manufacturing. Stethoscope.com sells the the newly released E-scope II in both the standard and headset models. This product can be interfaced with the handheld Compac Ipac to develop a phonocardiogram of the sounds you are listening to.