http://is.gd/P9YLKD
Spectra Precision GL622 Dual Grade Automatic Self-Leveling Digital Rotary Laser
Fully automatic up to +/- 25% grade on X/Y axes
Fully automatic vertical leveling and automatic axis features such as simplified Grade Match which measures and displays existing grades over unknown ground
Rugged construction able to withstand a drop up to 3 ft. onto concrete
Versatile with an operating range of up to 2600 ft. in diameter
Intuitive control keypad and an easy-to-read graphic display