Monitoring device

FIG. 1 is a top, front, right side perspective view of a monitoring device according to a first embodiment of our new design;

FIG. 2 is a top, front, left side perspective view thereof;

FIG. 3 is a front elevation view thereof;

FIG. 4 is a rear elevation view thereof;

FIG. 5 is a right side elevation view thereof;

FIG. 6 is a left side elevation view thereof;

FIG. 7 is a top plan view thereof; and,

FIG. 8 is a bottom plan view thereof.

The dot-dash broken lines in the figures represent boundaries of the claimed design and form no part of the claimed design. All other broken lines in the figures illustrate portions of the monitoring device which form no part of the claimed design.