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Topcon Positioning Systems’ (TPS) RL-100 series sets a standard for simplicity and accuracy. It features a new encoding system that provides the highest grade repeatability (5 arc seconds) of any laser. Available in single slope (RL-100S1) and dual slope (RL-100S2) models both instruments feature up to 25 percent grade range and up to 2,500 feet operating range — ideal for machine control. Its all-electronic operation makes setup easy and its high-contrast display makes entering grade quick and simple. The rechargeable battery pack provides up to 50 hours of operation; it also accepts alkaline batteries. Both instruments include the new Topcon LS-80 laser sensor featuring 13 channels of grade information, plus laser HI and low battery alert. The RL-100S2 also includes full remote control operation ” check operation status, change grades, verify battery life ” from up to 1000 feet away.