All you need for interior fit out in one tool. 5 perpendicular dots and two crosslines, vertical and horizontal. Auto leveling with a versatile base which has magnets, camera and survey tripod inserts, and screw attachments for framing. Highly visible beams, the prism for the dots are star cut to enable easy location of the center even over large distances. The vertical beam is over 120 degrees, easy to mark out on the floor and transpose to ceiling.