Ideal For Any Job That Requires A Straight Line Or Accurate Measurement. It can play three kinds of lines : Horizontal, Vertical, Cross Lines. Built-in 3 measuring water drop, which can confirm whether the surface of the object is horizontal / a 45 degree angle / vertical or not. Laser head can push up and down to line mold, there are three stalls can push. There is a scale on the side of the Level Laser Ruler ( 25cm, 6inches ) Locking 8-foot measuring tape.Standard and metric rulers.Note that do not force too much. Use this Multipurpose Laser Level for hanging pictures, installing shelving, laying flooring, hanging wallpaper and more. Specification: Size( L x W x H ) : 18.7cm x 6cm x 2.5cm Color : Black Laser light has an on / off power switch. Laser max output : Less than 0.5mW Powered by 3 x AG13 button cell battery (Included) Package Included: 1X Laser Level Aligner ,,,