"line level"的定义和意义

What is a "line level"?

A line level is a small, lightweight tool used to measure the level of a surface over a long distance. It consists of a bubble vial encased in a small frame that is hung on a string or wire. To use it, the string is stretched between two points, and the line level is positioned at the midpoint to ensure the line is level. It is commonly used for tasks like setting fences, leveling posts, or aligning garden structures, where long distances need to be measured for levelness. Despite its simplicity, it provides accurate results over a wide area.