CMM stylus extensions are accessories used in coordinate measuring machines (CMMs) to extend the reach of the CMM stylus. They allow for more flexibility in the measurement process by enabling the stylus to reach difficult-to-access areas of the part being measured.

CMM stylus extensions come in different lengths and materials, and can be made of materials such as carbon fiber, ceramic, and stainless steel. They are designed to fit onto the end of the CMM stylus, and may have a variety of tip configurations to suit different measurement requirements.