Trend DLB Digital Level Box utilises angle sensor technology to help find the angle on a surface quickly and accurately. Magnetic base for hands free use, so ideal for table mitre saws, with an accuracy to - 0.2 degrees for all angles. A zero button determines the angle changes from initial meaurement. Absolute level sensor. Large backlight for easy reading of angle. Automatic digital inversion. The DLB automatically shuts down after 5 minutes of inactivity. Measures in relative and absolute measurements. Relative mode measures the difference between two objects. Absolute mode neasures the angle between a flat surface and the first object. Dimensions 59mm x 59mm x 28mm approx Requires 1 x AAA LR03 1.5v Battery included.