A capping mechanism for a print engine includes a capping member mountable in alignment with a printhead of the print engine. The magnetic tunnel junction device includes: i) a first magnetic layer including a compound having a chemical formula of 100-yCy; ii) an insulating layer deposited on the first magnetic layer; and iii) a second magnetic layer deposited on the insulating layer and including a compound having a chemical formula of 100-yCy. The at least two airflow switches are serially coupled between the first and second terminals, monitor airflow from at least two fans in a computer room, and turn on or off according to strength of airflow from the at least two fans. During use, the tines of the apparatus are pressed against the skin of the patient such that they sit astride the vein to be accessed. The light source can be embedded in or located proximate to the light transmission medium to amplify, intensify, andor disperse light along the light transmission medium to provide a natural looking luminescence to the fishing lure.