FIG. 1 is a perspective view of a sphygmomanometer, showing my new design;

FIG. 2 is another perspective view thereof, the broken showing is for illustrative purposes only and forms no part of the claimed design;

FIG. 3 is a front view thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is a top view thereof;

FIG. 6 is a bottom view thereof;

FIG. 7 is a right side view thereof; and,

FIG. 8 is a left side view thereof.