<p>Magnetoresistive Sensors function on the principle of magnetoresistive effect where the magnetic field changes the resistivity of current. Their non contact operation eliminates wear and friction. Potential applications of Magnetoresistive Sensors include linear displacement measurement, current measurement and metal detection. It is also used in position sensor for material handling equipment, cylinder position sensing in pneumatic cylinders, polarity independent applications, presence/absence detection and lid sensor for laptop computers.</p> <p>Magnetoresistive Sensor SS552MT from Honeywell is small in size and has digital current sinking output. This Honeywell sensor is omnipolar that is; it can be operated with either North or South magnetic pole. The integrated circuit in this Honeywell magnetoresistive sensor provides a digital output in response to very low magnetic fields.</p>