Claims (1)
Claim 1 (Independent)
The ornamental design for a PH detection pen, as shown and described.
Full Description
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FIG. 1 is a perspective view of the PH detection pen showing my new design;
FIG. 2 is a front elevational view thereof;
FIG. 3 is a rear elevational view thereof;
FIG. 4 is a left side elevational view thereof;
FIG. 5 is a right side elevational view thereof;
FIG. 6 is a top plan view thereof; and,
FIG. 7 is a bottom plan view thereof.
Citations
This patent cites (8)
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