Concrete Crack Width Gauge: 0 cm - 16.5 cm, 1 mm tick-mark resolution. Standard Crack Gauge Width Ruler Including 31prection crack widths (mm): 0.1, 0.15, 0.2, 0.25, 0.3, 0.35, 0.4, 0.45, 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, 0.9, 0.95, 1.0, 1.5, 2.0, 2.5, 3.0, 3.5, 4.0, 4.5, 5.0, 5.5, 6.0, 6.5, 7.0. Coefficient of Thermal Expansion (α): 70 µm/m/°C from -30 °C to +30 °C . Rugged: Molded poly carbonate resists breaking — suitable for indoor or outdoor use Easy to Read and write: Bottom-printing virtually eliminates parallax and measurement distortion

• Coefficient of Thermal Expansion (α): 70 µm/m/°C from -30 °C to +30 °C
• Easy to Read and write: Bottom-printing virtually eliminates parallax and measurement distortion

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