A water vapor separating section, a compressor, and a main heat exchanger are connected in that order to form a cycle system. The screw driver has a compressed air return chamber for returning the piston to its top dead center by applying a compressed air in the return chamber to the piston. Swirling fluid is discharged from a front orifice and an extension is placed forward of the front orifice to confine the swirling fluid in a radial direction. The reflective layers are formed at the sidewalls of the pad facing the sides of the light guide plate to reflect light irradiated from the sides of the light guide plate back to the sides of the light guide plate. RAZs are displayed as \u201cgo, no-go\u201d signals on the computer monitor.