An attachment apparatus is provided for a measuring tape having upwardly curving side edges, a downwardly, substantially perpendicular tab at a leading end, and a scale along the length between the side edges. The apparatus includes an end fitting piece and a medial fitting piece. The end fitting piece has a leg and a seat. The leg extends from the piece to provide a measuring edge. The seat is configured to secure with the tab at the leading end of the tape. The medial fitting piece has a leg and a seat. The leg extends from the piece to provide a measuring edge. The seat is configured to mount onto the tape for slidable movement relative to the end fitting leg to define a distance between the measuring edges readable from the scale on the tape.