The ornamental design for a hand-held health monitor, as shown and described.
FIG. 1 is a front and right perspective view of a hand-held health monitor;
FIG. 2 is a right view thereof;
FIG. 3 is a left view thereof;
FIG. 4 is a front view thereof;
FIG. 5 is a rear view thereof;
FIG. 6 is a top view thereof; and,
FIG. 7 is a bottom view thereof.
The broken lines immediately adjacent to the shaded areas represent the bounds of the claim, while all other broken lines are directed to environment and are for illustrative purposes only; the broken lines form no part of the claimed design.