American Diagnostic Corporation ADSCOPE 600, Cardiology, Black 1/EA

I have used different stethoscopes throughout the years including Rappaport's, Littmann Classic's and Cardiology's. I can confidently say that the acoustics of this stethoscope is comparable with that of the Littmann Cardiology. The chestpiece does function as both bell and diaphragm by changing the exerted pressure on the chestpiece. This is useful for differentiating types of cardiac murmurs (such as the low pitched rumble of mitral stenosis vs the high-pitched murmur of aortic regurgitaton.)The chestpiece is machined quite nicely, no rough or sharp edges that I can discern. The ADC logo and the serial number can be seen (probably laser-etched) on the top. It feels substantial in your hand, neither heavy nor light, giving the chestpiece a nice touch of quality.The PVC tubing is quite thick in diameter, understandable for improved acoustics, and just the right length, not too long for sound transmission to suffer, and not too short either that you have to stay uncomfortably close to your patient. It is soft and flexible enough but still avoids kinking. Compared to most stethoscopes, the tubing seems to filter out a lot of (not all) adventitious noise.The earpiece is comfortable and does not hurt your ears from prolonged use. Just be careful, the earpiece is screwed on, and it easily unscrews. Personally, I wrap a short length of Teflon tape (used to seal water pipe connections) to keep the earpiece screwed on tightly.Since I'm only using this stethoscope for less than a month, I cannot comment on durability.Overall, I would recommend this stethoscope. It offers excellent value for money while still delivering excellent acoustics.