FIG. 1 is a bottom and front perspective view of the measuring instrument; FIG. 2 is a rear elevation view of the design; FIG. 3 is a front elevation view of the design, FIG. 4 is a right side elevation view of the design; FIG. 5 is a left-side elevation view of the design; FIG. 6 is a bottom plan view of the design; and, FIG. 7 is a top plan view of the FIG. 1 holder. Broken lining shows features of the measuring instrument that are not considered to be part of the design.