A manual instrument designed for introduction into and measurement of the nasal cavities and paranasal sinuses during diagnostic and/or surgical procedures. It typically consists of a hand-held, slender, rod-like metallic device with a fine blunt distal end...
A device that is used as a measuring reference point on an endodontic instrument used in a root canal procedure. It is typically designed as a flat ring made of an elastic material (e.g., silicone) that is placed at a predetermined distance from the distal ...