The Square Laser Level is an easy to use leveling tool designed for craftsmen. It retains the features of the old square laser level and produces two longer 90 right angle laser chalk lines that significantly extend the length of the square laser level. Instructions for use: Create 90 degree laser beams on any surface, install home decor, woodworking trim, tiles and draw lines. Double Bubble - Double horizontal bubbles provide precise flat or straight alignment. Retrievable I-beam remains stationary while working in a straight line. Applications: Suitable for a variety of uses including flooring, tile design, panelling, wallpapering, formwork, wall cladding, joinery finishes, socket and switch design, stud design and partition installation.Contains: device on/off and 2 suction cups.Function.Projects two lines at a 90 degree angle on the floor for surface design, including tile, stone, brick, carpet and hardwood flooring. Excellent alignment guide for calculating 90 degree layouts and 5 degree incremental rotation angles. One-touch power unit for simple operation and ease of use. Two suction cups allow the laser level holder to be mounted stably on the surface. Suitable for flooring, tiles, panelling, wall fixings, wallpaper, siding, veneered woodwork etc. Specifications. Material: ABS Colour: blueLaser wavelength: 650nmLaser class: IIClass II Dust/waterproof: IP-54Accuracy: +/- 3/8" / 100ft (+/- 1.5mm / 5m)Self levelling range: +/- 4 degreesPower: 3 x AA alkaline batteries (not included)Low voltage indication: power LED flashing Product dimensions: approx. 190 * 135 * 135 mm / 7.48 * 5.31 * 5.31 in Package weight: approx. 182 gPackage contains1 x 90 degree laser level