The ornamental design for a displayrack-mountable calibration board, as shown and described.
FIG. 1 is a front, right side, top perspective view of a display rack-mountable calibration board showing our new design;
FIG. 2 is a front elevational view thereof;
FIG. 3 is a rear elevational view thereof;
FIG. 4 is a left side view thereof;
FIG. 5 is a right side view thereof;
FIG. 6 is a top plan view thereof; and,
FIG. 7 is a bottom plan view thereof.
The evenly-spaced broken lines in FIGS. 1-7 illustrate portions of the display rack-mountable calibration board that form no part of the claimed design. The dash-dot-dash broken lines in FIGS. 1 and 6 illustrate the boundary of the claimed design which forms no part thereof.