The RollCheck laser alignment system speeds up alignment checks and the replacement of rolls in the processing industry. The laser transmitter and reflector sit on precision bases, and are either strapped on or magnetically mounted to the roll surface, allowing the user to project two lines, one horizontal, the other vertical, on to the corresponding reflector unit. Within two minutes of attaching the two components to adjacent rolls, the user can determine the alignment of the rolls. The devices can remain in place while adjustments to the roll are performed. The laser lines are green, which is a much brighter colour to the operator than red, and they provide a sharp, crisp visibility. The system is lightweight, compact, durable and easy to use. Applications include paper converting, films, roofing materials, steel, printing, textiles and paper recycling.