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Cracks monitoring Tell tales crack monitors Simple and cool analog crack monitor device. ±1 mm (±0.04") tick marks on X-Y axes; ±0.5 mm (±0.02") discrimination ±20 mm (±0.79") horizontal and ±10 mm (±0.38") vertical range High-quality polymer with easy-to-read measurement grid Crack monitoring scale is used to monitoring the cracks in the walls and how they evolved along the measured time.