A phantom system provides for the testing of diagnostic machines in a safe and efficient manner. First provided is a transparent cubic test device having a cylindrical aperture extending all the way to the rear face. The test device has a plurality of centered lines, making four equal squares on each face of the test system. There is a plurality of small bores positioned at all intersections of the scored white lines. A probe cylinder may receive and hold a probe. The cube has additional apertures to hold tissue testing and calibrating devices.