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Range: 0.004 - 0.100" (0.10 - 2.50mm)
This simple crack width ruler has been designed to provide inspectors with a low cost alternative to a graduated microscope for determining the width of a crack in concrete or other building materials.
Similar in size to a standard credit card, this transparent concrete ruler is marked with a range of graded lines, each with a specified width.
To use, position the gauge over the crack and identify which line is a similar width to the crack. Read off the width value.