What is the diaphragm retainer ring?

The retainer ring (shown in the image to the left) is a thin, black  section along the outer edge of the diaphragm. This ring screws clockwise onto the probe, encasing the electronics inside the device and attaching the diaphragm to the stethoscope. You can remove this ring by unscrewing it counter-clockwise until it easily lifts off the device, and you can use high pressure air to clean the space. For more information on these steps, click here.