DescriptionThis device is self-leveling with an accuracy range of within4. This is a compact, practical option for basic cross line leveling work. Work well from drop ceiling installation, lighting fixtures, photo frames aligning and wall tiling down to floor tiling etc.Features- Color: Black, yellow - Light Color: Green - Material: ABS - Size: About 6.80X6.60X3.80cm/ 2.67X2.59X1.49inch- Powered by AA batteries (not included) - This enables you to line up the exact horizontal and vertical coordinates of your project with ease. - Using the plumb dot under the unit and the cross point of lines on the ceiling. - For pictures hanging design, home refurb projects, wall construction, chandelier installation, mirrors, curtain rails etc. - High precision gradienter, practical and convenient, it can improve your working efficiency greatly. - Green light is 2 times brighter than red light with the same light source.