Elcometer 143 Crack Width Ruler

This simple gauge has been designed specifically to provide inspectors with a low cost alternative to a graduated microscope when determining the width of a crack in concrete or other building materials.
Similar in size to a standard credit card, this transparent gauge is marked with a range of graded line. Each line is 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.