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Topcon Positioning Systems’s RL-VH4G uses SmartScan beam control with line drawing and GreenBeam technology introduced by Topcon in 1997. The RL-VH4G also features electronic slope and alignment control as well as horizontal, vertical, plumb and 90-degree beam versatility. Radio remote control and line-of-sight are not required, and the package includes a height-adjustable wall mount for ceiling grid installations. With the 90-degree beam emitted from the top and bottom of the instrument, operators can establish corners and tees of 90-degree layouts and alignments.