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Spirit levels are made from a variety of materials including aluminum, plastic, wood, cast iron and composite materials. Users of spirit levels are categorized as professional contractors and tradesman, such as carpenters, masons, framers, electricians, plumbers and woodworkers; and do-it-yourselfers, such as a homeowner.There are other functional spirit level features beyond style and material such as magnetism, vial type and durability. Some spirit levels are magnetic which are ideal for construction with metal studs, or a plumber or electrician working around pipes and conduit. Magnet strength versus a spirit levels weight is an important test for quality; rare earth magnets are the strongest. Some spirit levels have replaceable vials, such as i-beam levels with barrel shaped vials which are set into the frame, or wood levels with banana-shaped vials. Block vials on box beam levels are machine set and cannot be replaced with the same accuracy as provided by the factory. Spirit levels are also made more durable with the inclusion of vial covers to protect the vial and end-caps to withstand the shock of being dropped. Some spirit levels have hand grips, which are primarily for comfort.