Spectra Precison DG211 Pipe LaserThe Spectra Precision DG211 is a compact, automatic self leveling pipe laser used for installing gravity flow sanitary pipe. With a grade range of 20% to +30%, it can handle a wide variety of jobsite requirements. The compact design is specifically designed to fit in 100 mm (4 in) pipe diameters. A large, easy to read Liquid Crystal Display (LCD) is included that indicates the current grade value, the roll position of the housing, the alignment