An apparatus is provided for assessing a persons ability to perform tasks requiring hand and eye co-ordination. An X-ray tube is moved in a circle or spiral about a z-axis in combination with a detector situated opposite and an object is scanned. The temperature control device has a probe on a second side substantially opposite the first side. The first cylinder is embodied, in one embodiment, as an engaging cylinder, and as a second embodiment as a puncture cylinder.