The Stabila LAX 400 Multi-Line Laser rotates horizontally through 360° for line marking and levelling around an entire room. It has a manual alignment function, where two lines form a 90° angle. With fine adjustment, the laser lines can be pivoted to a target position without losing the position of the plumb-line dot. The laser has a vertical beam which is directed downwards and is clearly visible through the adjustable feet. Above, the two vertical lines intersect precisely over the plumb line dot. The LAX400 is ideal for transferring a layout from floor to the ceiling and for quick and accurate plumb bobbing. It has a shock-absorbent soft-grip case. Specification Level Accuracy:± 0.3 mm/m.Self-Levelling Range:± 4.0°.Working Range: 20m.Power: 4 x AA batteries (supplied).Average Battery Life: 10 Hours.Tripod Thread: 1/4in.Laser Class: 2.Line Straightness:± 0.2mm/m, 90° Angle Precision:±0.3mm/m.Protection Class: IP54 rated, against splash & dust damage.