Millimeterwith LazerZone technology for 3D-GPS machine control systems offers vertical accuracy to within millimeters for finish grading of pads, near-flat , athletic fields, and other applications where vertical tolerances are less than 1/10 ft. Eliminates need for bluetops and grade stakes. PZL-1 zone-beam laser transmitter sweeps 2,000-ft.-dia. area with 33-ft.-high wall of laser light. Sensing unit mounted on machines vibration pole replaces GPS antenna. Multiple LazerZone-enabled machines can operate within range of a single transmitter, enabling simultaneous grading operations. Up to 4 linked transmitters extend horizontal range to nearly 8,000 ft. and vertical range to 130 ft.