A magnetic reader of the present invention comprises an MR sensor shielded by a magnetic shield including single domain soft magnetic materials. The device utilizes waste heat with a waste heat source cooled by a coolant, with a turbine and with an evaporating device for the coolant. The LEDs can be connected to a circuit board via the terminals being provided downwards. The radiation source may be configured a distance away from the radiation curable gel ink deposited on the substrate. According to the invention it is proposed that the composite body has a plurality of transport layers arranged in a stack-like manner between support layers for holding in each case a sample channel. In one aspect the flexible material is a magnetic vinyl.