BSpectra Precision GL622 Dual Grade Automatic Self-Leveling Digital Rotary Laser ReviewbP PP Spectra Precision GL622 Dual Grade Automatic Self-Leveling Digital Rotary Laser PFully automatic up to +- 25 grade on XY axesPFully automatic vertical leveling and automatic axis features such as simplified Grade Match which measures and displays existing grades over unknown groundPRugged construction able to withstand a drop up to 3 ft. onto concretePVersatile with an operating range of up to 2600 ft.