A hearing screener apparatus is provided. For example, in one implementation, an interconnection coupled to at least one double-layer capacitor that carries capacitor current to or from the at least one double-layer capacitor is functionally coupled to the at least one double-layer capacitor to reduce a temperature of the capacitor is provided. The image processor compares the maximum output max with a preset threshold. The object of a method for connecting at least two end portions of a flat filter medium is that the end portions are introduced between two legs each of a corresponding connecting element and that through heating the material of the legs is connected with the material of the filter medium. For uncoupling defective parts of the corresponding bus structure, all the actuators are provided with elements for cutting the ingoing and outgoing data lines and power lines. The shunt may include a pressure sensor capable of measuring pressure within an eye, coupled to the Venturi feature, the Venturi feature being configured to control flow from the inlet into the conduit in response to a pressure measurement from the sensor.