Crack Width Ruler
2.0 7.0 1.5 1.0 6.5 0.95 0.9 6.0 0.85 0.8 0.75 5.5 0.7 0.65 5.0 0.6 0.55 4.5 0.5 0.45 4.0 0.4 0.35 3.5 0.3