The Proscope 660 Nurses Stethoscope manufactured by ADC features a lightweight aluminum constructed chestpiece in 1 3/4 inches diameter. The Stethoscope features a non-chilling diaphragm to enhance acoustic responses. The 660 Stethoscope is equipped with a flexible 22 inch PVC tubing for measuring blood pressure. The 660 Stethoscope is also equipped with one pair of mushroom eartips.