Magnetoresistive (MR) technology also responds to a magnetic field, but in a different manner. The Hall element requires a field perpendicular to its surface, and is magnetic pole sensitive.  It’s behavior can vary depending on which type of integrated hall circuit is used and which pole is applied to it. An MR element’s resistance will change when a field parallel to its surface is applied. It is more sensitive than Hall technology, and is omnipolar, which means it will respond to either pole.