A UV absorption spectrometer includes a housing, a controller, and a sensor unit including an ultraviolet light source, an analytical area in an analytical cell or in running water or gaseous medium, and an UV wavelength separator including a UV detector. According to the present teachings, a representative brushless motor utilized in a power tool may comprise a stator, a rotor and a cooling fan. A failure related to the port is detected. The capacitance-responsive surface for the row of keys switches above the home row has a convex profile, and the capacitance-responsive surface for the row of keys switches below the home row has a concave profile, such that the keyboard can fold compactly upon itself. Specifically, the present invention relates to a process for ink jet printing on cloth using ultraviolet ray curable ink, which includes the steps of applying a transparent ultraviolet ray curable ink and then curing by ultraviolet rays, and thereafter applying a ultraviolet ray curable ink containing a coloring component to form an image.