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The ornamental design for a drinking water purification system monitoring device, as shown. |
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FIG. 1 is a perspective view of the present invention;
FIG. 2 is a front view of the present invention;
FIG. 3 is a rear view of the present invention;
FIG. 4 is a rear view of the present invention having a wall mount installed in the rear side;
FIG. 5 is a left end view of the present invention;
FIG. 6 is a right end view of the present invention;
FIG. 7 is a top view of the present invention; and,
FIG. 8 is a bottom view of the present invention.
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