An endodontic file having an extended measurement range of 14 mm is provided. The endodontic file comprises a shank, a washer and a handle, the shank having a proximal end, a distal end, a proximal region and a fluted region, the washer slidably located about the proximal region of the shank, wherein the improvement comprises an exposed shank in an annular groove in the handle, the exposed shank and the annular groove being about 1 to about 2 mm wide, such that in use, the exposed shank provides a user an extended depth measuring capability. A method of measuring a root canal depth is also provided.
