Patent ID: 6895675

Claim:
An apparatus for performing measurements on a substantially flat workpiece positioned on a surface, comprising: a base member engageable with the surface; a rotatable assembly engageable with the base member, the rotatable assembly having a portion that includes a straightedge adapted to extend over the workpiece, at least a part of the rotatable assembly being rotatable with respect to the base member such that the straightedge is relocatable with respect to the base member; and a measuring arm including a first leg slideably coupled to the assembly and at right angles to the straightedge, and at least one second leg extending from and at a right angle to the first leg and adapted to extend over the workpiece to define a distance between the straightedge and the second leg, wherein the second leg is substantially parallel to the straightedge of the assembly and separated by the distance from the straightedge as determined by the position of the first leg.