The Johnson Level Self-Leveling Cross and Line Laser can be used for indoor applications such as flooring, cabinetry, drop ceiling installation, wainscoting, carpentry, tiling, electrical boxes and switches, drywall track/stud wall installation and setting drainage slope. This laser combines the features of a cross-line laser with an additional 90 degree plumb line useful for checking square reference of beams, posts, or any other object. This measuring accessory has a 1/4 in.-20 tripod thread and manual mode also let you project orthogonal lines at any angle, for stairs and other non-level applications.2 Year Warranty