US D648643 S1
The ornamental design for a noise monitor, as shown and described.
FIG. 1 is a perspective view of a noise monitor showing the new design.
FIG. 2 is a side view thereof;
FIG. 3 is a bottom view thereof;
FIG. 4 is a top view thereof;
FIG. 5 is a front view thereof; and,
FIG. 6 is a back view thereof.
The broken line showing of structural features is included for the purpose of illustrating non-claimed subject matter and forms no part of the claimed design.