Bosch Laser Level and Square GTL2 VERSATILITY: The Bosch GTL2 Laser Level Square projects horizontal and vertical chalk lines on any surface up to 30 ft. to help you square, align and angle at 90 degrees. CONVENIENT: Features an alignment guide for 90-degree layout and calculates and turns angles in 5-degree increments. USER FRIENDLY: Simple one-button operation powers two perpendicular laser lines (90-degrees) on and off. SECURE: The Bosch GTL2 features an easy-to-press push button that secures the laser tool to smooth surfaces using non-abrasive adhesive ACCURACY: The Bosch GTL2 provides precision and accuracy to within 1 inch per 100 feet while the vials ensure a level tile. Class II laser product, 1mW power output