A dual spin-valve magnetoresistive thin film element includes a free magnetic layer, first and second nonmagnetic electrically conductive layers residing below and above the composite free magnetic layer, respectively, first and second dual pinned magnetic layers each having first and second pinned magnetic layers, and first and second antiferromagnetic layers. Such an arrangement can save both field engineers and manufacturers a significant amount of time. To communicate the measured pressure information to an external device, the CPU compares the pressure measured by the first pressure sensor to the pressure measured by the second pressure sensor and wirelessly communicates these compared pressures to an external device. A switch circuit is connected between the power source and the load and is coupled to and controlled by the controller. The controller is configured to adjust the excitation current no more than once during each spinning cycle; and to sequentially switch the excitation current to each of the plurality of terminals of the Hall plate during each spinning cycle. The filter supporting body may be displaced from a lowered position for loading the element for preparing the beverage, to a raised position for the infusion of the beverage, and again in the lower position for discharging the exhausted element.