I-Beam spirit level

An I-beam spirit level, also known as an I-beam level or a box level, is a tool used to determine whether a surface or object is level or plumb. It consists of a long, rectangular body shaped like an I-beam, hence the name, with one or more bubble vials embedded in it. These bubble vials contain liquid, usually colored alcohol, with a small air bubble trapped inside.

The I-beam level is designed to be placed on a surface or object, such as a beam or a wall, and the position of the air bubble inside the vial indicates whether the surface is level or plumb. When the bubble is centered between the two reference lines within the vial, it indicates that the surface is level horizontally. Similarly, when the bubble is aligned vertically with the center reference line, it indicates that the surface is plumb.

I-beam levels are typically made of aluminum or other lightweight materials to ensure ease of use and portability. They come in various lengths, ranging from a few inches to several feet, depending on the application. Some I-beam levels may also have additional features, such as built-in rulers or magnets for easy attachment to metal surfaces.

These levels are commonly used by professionals, such as carpenters, masons, and construction workers, to ensure accuracy and precision when installing or aligning various structures, such as walls, beams, cabinets, and shelves. They are also useful for DIY enthusiasts who need to ensure levelness and plumbness in their projects, such as hanging picture frames or installing shelves.

Overall, the I-beam spirit level is a versatile and essential tool in various industries and applications where precise leveling and plumbing are required.