A sensor utilizing a non-leachable or diffusible redox mediator is described. The pivot point for the rocker arm may be located centrally or at the end of the rocker arm that is opposite the rocker arm valve arm. Each body contact diffusion region defined by an exposed area in the body diffusion mask has a drawn area that overlaps the respective two adjacent polysilicon lines. The screw-down connection includes upgrading the existing socket machine screws to a socket retaining member. In addition, the system detects contact with an overlay button in the dynamic video overlay configured to toggle visibility of the dynamic video overlay. Then, the capping region is removed so as to expose the positioning region to the surrounding ambient.