394965 Silverline Gradient Laser Level is a level that is not a level at all, each vial is set to indicate a gradient of 1, 2, 3 or 4 degrees from the horizontal, if you have ever tried to lay terrace with a slight fall across its entire length you will no doubt appreciate what a brilliant and simple tool this is 600mm long with 6 vials, this clever aluminium level also features a built in laser making it ideal for setting gradients over long distances such as patios, guttering, drains, roofs and floors, the built in laser projects your chosen gradient up to 30mtr, the level also has a magnetic base, milled and ground bottom face, includes 90 degree and line generating prisms, this unit IS NOT supplied with 2 x AAA required to power it