Topcon Positioning Systems has introduced a new generation of slope lasers (the RL-100 Series) that features a new encoding system designed to provide "the highest grade repeatability (5 arc seconds) of any laser." Available in single-slope (RL-100S1) and dual-slope (RL-100S2) models, the new instruments feature a grade range up to 25 percent and an operating range of 2,500feet — capabilities, says Topcon, that make these lasers ideal for machine control.