The present invention is a hair conditioning composition includes approximately 40,000 IU of Vitamin E oil from 2 fl. The apparatus includes a sensor configured to emit an energy beam toward a surface of interest and to detect an energy beam therefrom, the detected energy beam being indicative of parameters of a characteristic of interest of the surface of interest. The keyboard assembly has a layer of rigid material which separates the elastic layer from the printed wired board located under the rigid layer. In another mode of operation regression suites are constructed so as to maximize task coverage when a fixed number of tests are run or within a fixed cost.