Abstract: Methods and apparatus for measuring wear on the contact faces of a mid-span shroud of the type extending between the adjacent blades of a gas turbine engine are disclosed. A segment of the shroud extends circumferentially from each blade into abutting relationship with a corresponding segment extending from the adjacent blade. Each segment has a contact face which is susceptible to wear at the abutting location with the adjacent segment. In one engine embodiment, the contact faces are coated with a wear resistance material to prolong the effective life of the shroud. The initial depth of the wear resistant coating or the extent of the abrasion after use are measurable in accordance within the concepts taught herein.