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- Mar 15, 2010
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my dads been in construction for a while and he pulled out this laser grader or marker and was showing me. theres a 5mW laser mounted in the head which spins and makes a line across the wall,floor, and ceiling. its used to get straight walls and ceiling tiles and he said 10 or so years ago it was worth 6,000 brand new. http://s826.photobucket.com/albums/zz183/DakotaDaNative/grade marker/grade marking laser/
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