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The JOHNSON LEVEL TOOL 555 is a 3-inch aluminum line level designed for tradespeople and skilled DIYers who need a reliable, lightweight leveling reference on a string or line. The hexagonal aluminum body provides a secure grip and resists wear under job-site conditions. Weighing just 0.056 pounds, the 555 minimizes line sag — a common source of measurement error when running long spans. Unrestricted hooks allow the level to slide freely along the line for quick repositioning without removing it entirely.
The 555 is suited for horizontal leveling tasks across a range of trades and applications. Masons use it to keep coursework true over long runs of block or brick. Landscapers rely on it for grading, drainage slope work, and establishing grade stakes. Sheet metal contractors use it to check horizontal alignment on ductwork runs and support framing. Its compact size makes it easy to carry on the belt or in a tool pouch throughout the workday.
Designed as a general-purpose line level compatible with standard mason lines, string lines, and layout lines used in masonry, landscaping, and sheet metal work.
Hook the 555 onto a taut string or mason line at the midpoint of the span to get the most accurate reading. A slacker line will introduce sag error regardless of the level reading, so ensure the line is pulled firm before checking the vial. No tools are required for attachment or removal. This type of line level is typically used by masons, landscapers, and general contractors as part of standard layout and grading work.
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