Roll alignment has two basic components, which includes roll straightness and parallelism in both the vertical and horizontal directions. Straightness is simply a measure of each individual roll in a system to see if it is worn, damaged, sagging, or deflecting under its own weight. Checking roll parallelism in the vertical orientation can be done by either of two methods: laser leveling or adjustment with a machinist's level. This roll alignment tool is simply placed on top of a roller and an adjustment made by turning a small knurled knob to zero the device. This tool can be used for comparing or repositioning rolls in the vertical orientation.