... handle it. 3. Accuracy: +3/8"/100ft. Two highly focused self-leveling laser beams provide accuracy of 3 ... Diagonals and Footings for Decks, Porches, and Patios; Grade Determination; Dry Wall Installation.Product nameItem NumberFeatureTechnical SpecificationsLaser Line ... Diagonals and Footings for Decks, Porches, and Patios; Grade Determination; Dry Wall Installation. Accessories:Cloth bag, Magnetic ...