The ornamental design for a belt for a medicalmonitor, as shown and described.
FIG. 1 is a top perspective view of a belt for a medical monitor showing my new design;
FIG. 2 is a top view thereof;
FIG. 3 is a bottom view thereof;
FIG. 4 is a side view thereof;
FIG. 5 is an opposite side view thereof;
FIG. 6 is a front view thereof;
FIG. 7 is a rear view thereof; and,
FIG. 8 is a bottom perspective view.
The dash-dot broken lines depict the boundaries of the claimed design and form no part thereof. The dash-dash broken lines illustrate portions of the belt for a medical monitor that form no part of the claimed design.