The ornamental design for a magnifier, as shown and described.
FIG. 1 is a front side perspective view of a magnifier showing my new design;
FIG. 2 is a front elevational view thereof;
FIG. 3 is a top plan view thereof;
FIG. 4 is a bottom plan view thereof;
FIG. 5 is a view thereof during using;
FIG. 6 is a front side perspective view of a second embodiment of the design of FIG. 1;
FIG. 7 is a front elevational view of FIG. 6;
FIG. 8 is a top plan view of FIG. 6;
FIG. 9 is a bottom plan view of FIG. 6; and,
FIG. 10 is a view of FIG. 6 during using.
The rear elevational view, the left side elevational view and the right side elevation view of FIG. 1 are not shown for being the same with the front elevational view of FIG. 1. The rear elevational view, the left side elevational view and the right side elevation view of FIG. 6 are not shown for being the same with the front elevational view of FIG. 6.