In general, here are the steps to follow when using a laser level.
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How To Use a Level Over Long Distances
Use a rotary laser level for tasks like setting concrete form boards, cutting fence post tops or building retaining walls.
After testing and with key considerations in mind, we chose the DeWalt DW089K 3-Beam Line Laser Level as our best overall pick for its easily visible red beams, self-leveling feature, micro-adjust ...