Includes: 1) 400mm sturdy aluminum box section spirit level with two acrylic vials: a) Spirit accuracy: 0.5/mm/m b) A strong magnet built in 2) Specifications: a) Wavelength: 650nm b) Working distance: 50m c) Visibility: 150m d) 15m circle of light e) φ8 x 10mm 3) Output:=<1MW/3MW 4) Power: 2 x AAA batteries 5) System horizontal precision: 0.029 = 0.5/1000