The ornamental design for a babymonitormastercontroller, as shown and described.
FIG. 1 is a first perspective view of an embodiment of a baby monitor master controller showing the claimed new design;
FIG. 2 is a second perspective view thereof;
FIG. 3 is a front elevation view thereof;
FIG. 4 is a rear elevation view thereof;
FIG. 5 is a left side elevation view thereof;
FIG. 6 is a right side elevation view thereof;
FIG. 7 is a top plan view thereof; and,
FIG. 8 is a bottom plan view thereof.
The broken lines represent boundaries of the claimed design. The broken lines depict environmental subject matter that forms no part of the claimed design. The broken lines in the drawings depict portions of the baby monitor that form no part of the claimed design. The broken lines and unshaded regions bounded by broken lines form no part of the claimed design.