Manual line measuring work cannot assure 100% accuracy and precision. However, accurate 90 degree cross hair generating laser alignment can always makes the most accurate and no mistake two perpendicular line generation easily. After garment workers making proper connecting of electric power supply and proper adjustment of cross line generating direction and angle, 650nm red laser alignment will begin to project super accurate and precise two perpendicular lines accurately and precisely. At the same time, this advanced red laser module is always available with quite affordable price.