Concrete forms and footers. Concrete sections needing grade for water run-off Short run sewer connections. Ditch banks up to 25% grade Easy to use self-leveling grade laser that's perfect for shorter range grading. Directional bright visible beam for "above-the-top" pipe work. Accuracy: <1/16" at 100ft Diameter range: 2600ft/ 800m. Grade mode is 0.06 percent, Manufacturer: Spectra Precision Laser