I get its a level of some sort, I just don’t understand.
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It’s basically a tube filled with water. Takes advantage of the idea that water will settle to the same level even over long distances as long as it can flow freely.
Classic use case. Say you have a building and you are laying bricks and you want the the brick to be level. You put one end of the tube on one side, then hundreds of feet away you put the other end. Fill the tube with water and now you have two points that are level. Run a string between the two and now you have a level line that runs hundreds of feet you can match your bricks to.
You use the bubble of air in the water to show you if your wall/thing is level. The bubble has to be in the center or the thing is not level.
Get a water hose (clear poly is easier to read but not necessary), fill it up. Stretch it all the way out holding the ends up so no water spills out. The water level at both ends of the hose will be at the exact same height. As long as you dont spill any, the different ends can be moved to any distance possible and will still be at the same level. The water is leveled inside the tube by gravity.
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