Probe for determining magnetic marker locations

A probe for detecting a magnetic marker, the probe comprising:

• an elongated wand including a base, a sensing tip, and an extension portion extending along a longitudinal axis of the elongated wand between the base and the sensing tip, wherein a cross-sectional shape of the base, along the longitudinal axis, differs from a cross-sectional shape of the extension portion, along the longitudinal axis;
• a first sensor positioned within the base, the first sensor including a first magnetometer and a first accelerometer, the first sensor including a first range for detecting the magnetic marker;
• a second sensor positioned in the sensing tip, the second sensor including a second magnetometer and a second accelerometer, the second sensor including a second range for detecting the magnetic marker, wherein the extension portion defines a separation distance between the first sensor and the second sensor, and wherein the separation distance between the first sensor and the second sensor is greater than the first and second ranges;
• and
• a processor electrically connected to each of the first and second sensors, the processor configured to receive an output from the first sensor and an output from the second sensor and to determine a distance and direction between the probe and the magnetic marker by comparing the output of the first sensor with the output of the second sensor.