The present invention relates to a real time quantitative TaqMan MGB probe useful for detecting the mitochondrial gene C1494T mutation associated with maternally inherited deafness and the use thereof. The apparatus forms a peer-to-peer communication link with a second apparatus. The present invention is advantageous because it provides for an increased number of users and better reliability for wireless subsystems operating in increasingly overcrowded frequency bands. The marker is inserted thorough edge openings on the tool body so as to display one of the printed images in the window. The profile bar screen is designed with horizontal support arches that have expansion slots allowing the otherwise rigid structure of the support arches to flex and adapt to any unevenness of the vessel wall, thus allowing support shoulders to rest against the inside of the vessel wall.