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.
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