The dw089k from dewalt is a self levelling ultra bright multi line laser ideal for a wide range of measuring and levelling applications featuring three laser lines for horizontal vertical and side applications the dw089k works to an accuracy of to plusmn03 mmm and surface angle of 4 degrees easy to use with 3 button operation the dw089k has a magnetic bracket for easy mounting and even comes complete with 4 aa batteries to get you going straight out of the box