A system and method for continuous non-invasive glucose monitoring is disclosed. The modular graft includes a first component having first and second leg portions which mate with second and third graft components, respectively. The junction box includes internal mounting lugs that extend from the opening of the junction box toward but short of the back wall, and which thus provide an improved volume within a junction box of a standard size. The light source is configured to project light away from the telephone test set to illuminate an area adjacent the telephone test set. In the intermediate position, the object holders are exchanged, after which the first series of positioning steps can be carried out by the first displacement unit with the second object holder in the first position and the second series of positioning steps can be carried out by the second displacement unit with the first object holder in the second position.