A medical instrument includes first and second support members movably coupled to one another to provide variable spacing between distal portions of the support members. A first engagement element is attached to the distal portion of the first support member and extends generally along a first axis, and a second engagement element is attached to the distal portion of the second support member and extends generally along a second axis. At least one of the engagement elements includes an articulating portion articularly engaged with a mounting portion to provide multi-axial movement therebetween to thereby vary an angular orientation of the first axis relative to the second axis. An indicator extends between proximal portions of the support members and includes multiple indicia corresponding to variable distances between the first and second axes adjacent the engagement elements to provide an indication corresponding to a select distance between the first and second axes adjacent the engagement elements.
