Multi-Function Laser Levels: 4-in-1 directive, laser beam, ruler and tape measure (8ft), designed for every situation where a straight line or measurements are needed.3 layers: the laser level with a level, welding and a 45 bubble to determine the horizontal and vertical level. For more precise results. Comes with 3 AG 13 button batteries to ensure you continue with maximum comfort.Suitable for hanging photos along a stairwell, hanging mirrors, installing curtain rods and other household items; the laser part can be used separately and alone; only for the interior (ideal for the gift of the father).Easy to use: it is equipped with a selection button on the front. It controls the switching of vertical laser line, horizontal laser line and cross laser line mode, is suitable for different use modes, more precise and stable.