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The ornamental design for a ph meter, as shown. |
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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.
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| Executed on | Assignor | Assignee | Conveyance | Frame | Reel | Doc |
| Aug 31 1987 | TROTTMANN, JERRY B | HACH COMPANY, LOVELAND, COLORADO A CORP OF | ASSIGNMENT OF ASSIGNORS INTEREST | 004786 | /0786 | |
| Sep 04 1987 | Hach Company | (assignment on the face of the patent) | / |
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