US D312421 S
FIG. 1 is a top, front and right side perspective view of a pH meter showing my new design;
FIG. 2 is a top plan view;
FIG. 3 is a left side perspective view;
FIG. 4 is a bottom plan view;
FIG. 5 is a right side perspective view;
FIG. 6 is a front elevational view; and
FIG. 7 is a rear elevational view thereof.