I built a stethoscope because in an emergency or just for a check up you might need to check your heartbeat to see if you in good condition to stay in space. It would be used for checking your heart beat. This stethoscope will be made out of nylon. This stethoscope looks like a normal one just with some differences. You can also use this to see if your heartbeat changes with low gravity. This would be important because if the astronauts are safe and healthy, so that the astronauts can stay on the space station.