Stethoscopes will make you feel good about the reliability and durability of this unit. The adjustable frequency diaphragm technology allows you versatility in this single sided unit, by giving you access to the traditional low frequencies of a bell and the high frequencies of a diaphragm with a simple adjustment in pressure on the chest piece during your exam. This unit has been ergonomically engineered for both comfort and acoustic sensitivity. The chest piece is made from surgical stainless steel and has a non chill diaphragm for your patients comfort. The rugged durability of this piece will stand up to even the most unforgiving conditions. The ear pieces have been configured at a 15 degree angle to give you the most comfort and the best acoustics. In addition, the threaded tp PVC ear tips are incredibly comfortable and provide a good seal that eliminates room noise and allows you the best acoustic seal available. The dual bore lumen PVC tubing stays soft and flexible and reduces rubbing noise.