Stethoscopes listen to the heartbeat and check your health by those sounds. A doctor's stethoscope placed on the back or chest evaluates the well-being of kids and adults. You can find a stethoscope online from different brands. Littman is the best stethoscope with a high sensitivity level and reliability. Their instrument with advanced features is also the best stethoscope for medical students. The pediatric stethoscope can hear higher frequencies with its dual-sided chest piece.