Features:  -This product is widely used in construction and building, such as bricklaying,cutting plates, decoration, ect.  -It casts horizontal or vertical benchmark lines in working.  -Its high-accuracy and speedy assures the quality of construction and make the process of construction convenient.  -Self leveling and beyond the scope of automatic alarm function.  -Can rotate 360 degrees to instrument, make a beam of light to any areas of need.     Specifications:  Type: rotary laser level meter.  Optical maser wavelength: 510nm±5nm(nm).  Measurement range: 2-100m(electronic).  Accuracy: ±3nm/10m.  Leveling/Compensation range: 4°±1°.  Working distance(Line): 30m.  IP Rating: IP54.  Power source: 4x "AA"(LR6).  Material: ABS.  Operating range: 30 M, ≥50M with target board.  Operating temperature: -10℃~50℃.  ambient temperature: -20℃~70℃.     Package inclues:  1x laser level meter.  4x 2A battery.  1x Carry Box.  1x L shape bracket.  1x user manual