You will just need to replace the upper laser housing on your Dewalt Laser Level. The part # is 595183-00 and runs around $38.00.
Here is a link: http://www.toolsandmachinery.com/search/results.html?osCsid=0921e2dda2b9ae4c642612ecc3906e43&keywords=595183-00&x=58&y=6
Don- www.toolsandmachinery.com, May 2009