Self-Leveling Horizontal, Vertical, 90-degree and Manual Slope in Dual Axis +/- 1.5mm at 30 M (1/16" at 100 Ft) Scanning -degrees: 10, 45, 90 Offering high versatility in general construction and interior applications, the Leica Rugby 640 universal laser allows contractors to perform all horizontal, vertical and simple slope tasks quickly and reliably. For easy beam detection, use the simple Leica Rod Eye Basic laser receiver. For extended range and performance, upgrade to Leica Rod Eye 140 or Rod Eye 160 digital receivers.