Hello everyone I am new to the forum , it seems that you guys are the people who can help me. I am trying to build something to displays a circle for about 20-30 feet. I need it for a job that i am doing, I am going to run something from the ground of a building all the way to the roof. The issue is that there are wires and beams that might interfere with my job, so that is why I want to build something with lasers to display a circle from the ground to the roof . This way i can till if they beams , and wires are in my way or not. I bought a 5MW laser from ebay and works well . Please help :lasergun: