A device for aligning a vehicle with a next pass through a field comprises a camera which takes a corresponding natural picture. When the optical scanner is powered on, the optical module scans the first reference white board and the second reference white board to obtain data of image quality test and brightness variations in Y direction first, and through software compensation and correction, to obtain a normal digital image data thereby to achieve rapid preview and scanning. The hair dye composition or hair bleach composition according to the present invention suppresses hair damage during dyeing or bleaching, does not impair the moisture intrinsic to the hair, and provides excellent feeling upon use. A hydraulic pressure supplying portion supplies the hydraulic pressure to the first hole, and a hydraulic pressure exhausting portion receives the hydraulic pressure from the second hole.