The ornamental design for a magneticsensor, as shown and described.
FIG. 1 is a front, top, and left side perspective view of a magnetic sensor;
FIG. 2 is a rear, bottom, and right side perspective view thereof;
FIG. 3 is a front elevational view thereof;
FIG. 4 is a rear elevational view thereof;
FIG. 5 is a top plan view thereof;
FIG. 6 is a bottom plan view thereof;
FIG. 7 is a left side elevational view thereof; and,
FIG. 8 is a right side elevational view thereof.
The pair dash-dot-dash lines on the sensor arm in FIGS. 1-4, 7, and 8 depict an indeterminate length for the sensor arm and the pair dash-dot-dash lines and the portion of the sensor arm therebetween form no part of the claimed design.