The Littmann has two double chest pieces that work the same, but they have two different diameters. The one with a small diameter is meant to be used with children and the larger one is made to be used by adults.
According to this article, you will have to learn about the benefits and the features of electronic stethoscope if you want to buy one.
The disadvantage of an acoustic stethoscope is how the volume of the sound captured is too low. If you wish to keep the records of how the patient is progressing, then these records cannot be too descriptive because there is no way of recording auscultations. To deal with this problem, then the development of the digital stethoscope started at the market. The acoustic membrane had been replaced by the use of digital membrane. It is capable of capturing the sound using better frequency range. The sound will not be sent at once in the ears, but it will be digitally processed so it is easy to make diagnoses and to know when there are anomalies. These anomalies are not perceptible if you use acoustic stethoscope.
The following are some of the features to expect from digital stethoscopes.
Sound amplification system: There are some models like digital Littmann models which are capable of amplifying the volume 24 times the normal. This is useful function in the patients who suffer obesity and when there is a need to record the inaudible anomalies.
Noise reduction technology for frictional and environmental noise: sometime the hospitals may not be too quiet as they have to be. Besides by amplifying the sound, then it is also possible to amplify the noise in the background. However, it is possible to have filtering system which will clean the noise and you can get a perfect sound. The technology in the digital stethoscope is able to offer clean and clear auscultations.
Wireless Bluetooth connectivity with file saving
Many digital stethoscopes allow the user to record and to save auscultation records. Some of the stethoscopes allow these records to be sent into the computer at once by using a Bluetooth connection. The function helps when there is a need to include auscultation into the medical reports or to send them through email if you want a second opinion of another doctor. The record can also be displayed graphically like phonogram.
Even if this article tries to tell you about how you can differentiate stethoscopes based if they use electronic or acoustic technology. The distinction will not help you if you want to decide about which type of the stethoscope to buy.
Before you buy any stethoscope, you will have to decide first the performance and fidelity needed with your stethoscope. If you work as pulmonologist, internist, anesthesiologist or cardiologist, then you need to look into high performance models.
You can find some stethoscope which had been designed in the way that they can listen to different sounds such as S1, S2, S3 or S4 with grade 1 murmur. However, you will find that most stethoscopes in this category have the world cardiology in their name but it is not meant to be used exclusively with cardiology application.