Spectra GL422N Dual Grade Laser with Vertical Alignment Self-leveling 2,600-foot
Spectra GL422N Dual Grade Laser with Vertical Alignment Self-leveling 2,600-foot. Overview for the Spectra GL422N Dual Grade Laser with Vertical Alignment. The Spectra Precision GL422N Dual Grade Laser was designed for a wide range of general construction, site preparation and excavations. This ruggedized, automatic slope laser provides contractors with accurate leveling, grading and vertical alignment.