alt Hacker NewsOver long distances the string will sag in the middle. That's one of the reasons (not the only reason) construction uses lasers today.
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boothby • today at 3:39 PM
It depends what you need that line for -- if you're projecting onto a wall, that sag matters. If you're projecting onto the ground, it doesn't.
yeah its pretty hard to get new help to pull hard without fear of breaking the tool, coincidentally the beam width of a laser will increase over long distance, similar to line slack sagging over long distance.