Highly durable with a tough industrial design. Ideal set-out tool for installation, studwork and any floor-to-ceiling transfer applications. Self-levelling, 4-beam system offers square, plumb and level uses. Automatic 'out-of-level' sensor. Magnetic front base plates fix to metal stud. Specifications: Laser class II. Range 30m with small, intense dots. Includes 4 x AA Alkaline batteries. Size, 50 x 128 x 100mm.